{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" }, { "category": "details", "text": "CVE-2026-27855: fix OTP authentication replay attack via auth cache\n- CVE-2026-27856: fix doveadm credential timing oracle\n- CVE-2026-27857: fix excessive memory usage from deeply nested IMAP command lists (pre-auth ID command)", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.6esu/advisories/2026/clsa-2026_1778220630.json" } ], "tracking": { "current_release_date": "2026-05-08T06:11:29Z", "generator": { "date": "2026-05-08T06:11:29Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1778220630", "initial_release_date": "2026-05-08T06:11:29Z", "revision_history": [ { "date": "2026-05-08T06:11:29Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "dovecot: Fix of 3 CVEs" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.6", "product": { "name": "AlmaLinux 9.6", "product_id": "AlmaLinux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_name", "name": "Rocky Linux 9.6", "product": { "name": "Rocky Linux 9.6", "product_id": "Rocky Linux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:resf:rocky_linux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Rocky Linux" } ], "category": "vendor", "name": "Rocky Linux" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product": { "name": "dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_id": "dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot-pigeonhole@2.3.16-15.el9.tuxcare.els1?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product": { "name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_id": "dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot@2.3.16-15.el9.tuxcare.els1?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product": { "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_id": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot-devel@2.3.16-15.el9.tuxcare.els1?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product": { "name": "dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_id": "dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot-mysql@2.3.16-15.el9.tuxcare.els1?arch=x86_64&epoch=1" } } }, { "category": "product_version", "name": "dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product": { "name": "dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_id": "dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot-pgsql@2.3.16-15.el9.tuxcare.els1?arch=x86_64&epoch=1" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "product": { "name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "product_id": "dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot@2.3.16-15.el9.tuxcare.els1?arch=i686&epoch=1" } } }, { "category": "product_version", "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "product": { "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "product_id": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dovecot-devel@2.3.16-15.el9.tuxcare.els1?arch=i686&epoch=1" } } } ], "category": "architecture", "name": "i686" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" }, "product_reference": "dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64" }, "product_reference": "dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.i686 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686" }, "product_reference": "dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686" }, "product_reference": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of AlmaLinux 9.6", "product_id": "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64" }, "product_reference": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "AlmaLinux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of AlmaLinux 9.6", "product_id": 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"name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64" }, "product_reference": "dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-1:2.3.16-15.el9.tuxcare.els1.i686 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686" }, "product_reference": "dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686" }, "product_reference": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64" }, "product_reference": "dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64" }, "product_reference": "dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64" }, "product_reference": "dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27855", "cwe": { "id": "CWE-294", "name": "Authentication Bypass by Capture-replay" }, "notes": [ { "category": "description", "text": "Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-27855" }, { "category": "external", "summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json", "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json" } ], "release_date": "2026-03-27T09:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-05-08T06:10:33.762585Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630", "product_ids": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630" } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "products": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] }, { "cve": "CVE-2026-27856", "cwe": { "id": "CWE-287", "name": "Improper Authentication" }, "notes": [ { "category": "description", "text": "Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-27856" }, { "category": "external", "summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json", "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json" } ], "release_date": "2026-03-27T09:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-05-08T06:10:33.762585Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630", "product_ids": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630" } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "products": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] }, { "cve": "CVE-2026-27857", "cwe": { "id": "CWE-400", "name": "Uncontrolled Resource Consumption" }, "notes": [ { "category": "description", "text": "Sending \"NOOP (((...)))\" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Install fixed version, there is no other remediation. No publicly available exploits are known.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-27857" }, { "category": "external", "summary": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json", "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json" } ], "release_date": "2026-03-27T09:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-05-08T06:10:33.762585Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630", "product_ids": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1778220630" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "AlmaLinux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "AlmaLinux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.i686", "Rocky Linux-9.6:dovecot-devel-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-mysql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pgsql-1:2.3.16-15.el9.tuxcare.els1.x86_64", "Rocky Linux-9.6:dovecot-pigeonhole-1:2.3.16-15.el9.tuxcare.els1.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }