{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "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 Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27856.json" } ], "title": "dovecot: Doveadm: Full access via timing oracle attack in credential verification", "tracking": { "current_release_date": "2026-06-30T04:03:04+00:00", "generator": { "date": "2026-06-30T04:03:04+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.0" } }, "id": "CVE-2026-27856", "initial_release_date": 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"relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "dovecot.src as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:dovecot.src" }, "product_reference": "dovecot.src", "relates_to_product_reference": "red_hat_enterprise_linux_9" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27856", "cwe": { "id": "CWE-208", "name": "Observable Timing Discrepancy" }, "discovery_date": "2026-03-27T09:01:28.297292+00:00", "flags": [ { "label": "vulnerable_code_not_present", "product_ids": [ "red_hat_enterprise_linux_10:dovecot", "red_hat_enterprise_linux_10:dovecot-devel", "red_hat_enterprise_linux_10:dovecot-mysql", "red_hat_enterprise_linux_10:dovecot-pgsql", "red_hat_enterprise_linux_10:dovecot-pigeonhole", "red_hat_enterprise_linux_10:dovecot.src", "red_hat_enterprise_linux_8:dovecot", "red_hat_enterprise_linux_8:dovecot-devel", "red_hat_enterprise_linux_8:dovecot-mysql", "red_hat_enterprise_linux_8:dovecot-pgsql", "red_hat_enterprise_linux_8:dovecot-pigeonhole", "red_hat_enterprise_linux_8:dovecot.src", "red_hat_enterprise_linux_9:dovecot", "red_hat_enterprise_linux_9:dovecot-devel", "red_hat_enterprise_linux_9:dovecot-mysql", "red_hat_enterprise_linux_9:dovecot-pgsql", "red_hat_enterprise_linux_9:dovecot-pigeonhole", "red_hat_enterprise_linux_9:dovecot.src" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2452171" } ], "notes": [ { "category": "description", "text": "A flaw was found in Doveadm, a component of Dovecot. An attacker can exploit a timing oracle vulnerability during the direct comparison of credentials. This allows the attacker to determine the configured credentials, potentially leading to full unauthorized access to the affected component.", "title": "Vulnerability description" }, { "category": "summary", "text": "dovecot: Doveadm: Full access via timing oracle attack in credential verification", "title": "Vulnerability summary" }, { "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": [ "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.i686", "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.ppc", "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.ppc64", "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.ppc64le", "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.s390", "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.s390x", "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.src", 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"known_not_affected": [ "red_hat_enterprise_linux_10:dovecot", "red_hat_enterprise_linux_10:dovecot-devel", "red_hat_enterprise_linux_10:dovecot-mysql", "red_hat_enterprise_linux_10:dovecot-pgsql", "red_hat_enterprise_linux_10:dovecot-pigeonhole", "red_hat_enterprise_linux_10:dovecot.src", "red_hat_enterprise_linux_8:dovecot", "red_hat_enterprise_linux_8:dovecot-devel", "red_hat_enterprise_linux_8:dovecot-mysql", "red_hat_enterprise_linux_8:dovecot-pgsql", "red_hat_enterprise_linux_8:dovecot-pigeonhole", "red_hat_enterprise_linux_8:dovecot.src", "red_hat_enterprise_linux_9:dovecot", "red_hat_enterprise_linux_9:dovecot-devel", "red_hat_enterprise_linux_9:dovecot-mysql", "red_hat_enterprise_linux_9:dovecot-pgsql", "red_hat_enterprise_linux_9:dovecot-pigeonhole", "red_hat_enterprise_linux_9:dovecot.src" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-27856" }, { "category": "external", "summary": "RHBZ#2452171", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452171" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-27856", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27856" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27856", "url": "https://nvd.nist.gov/vuln/detail/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": "2026-03-27T08:10:19.537000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-06-17T12:10:58+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "7Server-ELS:dovecot-1:2.2.36-8.el7_9.1.i686", 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"7Server-optional-ELS:dovecot-devel-1:2.2.36-8.el7_9.1.x86_64", "red_hat_enterprise_linux_10:dovecot", "red_hat_enterprise_linux_10:dovecot-devel", "red_hat_enterprise_linux_10:dovecot-mysql", "red_hat_enterprise_linux_10:dovecot-pgsql", "red_hat_enterprise_linux_10:dovecot-pigeonhole", "red_hat_enterprise_linux_10:dovecot.src", "red_hat_enterprise_linux_6:dovecot", "red_hat_enterprise_linux_6:dovecot-devel", "red_hat_enterprise_linux_6:dovecot-mysql", "red_hat_enterprise_linux_6:dovecot-pgsql", "red_hat_enterprise_linux_6:dovecot-pigeonhole", "red_hat_enterprise_linux_6:dovecot.src", "red_hat_enterprise_linux_8:dovecot", "red_hat_enterprise_linux_8:dovecot-devel", "red_hat_enterprise_linux_8:dovecot-mysql", "red_hat_enterprise_linux_8:dovecot-pgsql", "red_hat_enterprise_linux_8:dovecot-pigeonhole", "red_hat_enterprise_linux_8:dovecot.src", "red_hat_enterprise_linux_9:dovecot", "red_hat_enterprise_linux_9:dovecot-devel", "red_hat_enterprise_linux_9:dovecot-mysql", "red_hat_enterprise_linux_9:dovecot-pgsql", "red_hat_enterprise_linux_9:dovecot-pigeonhole", "red_hat_enterprise_linux_9:dovecot.src" ] } ], "title": "dovecot: Doveadm: Full access via timing oracle attack in credential verification" } ] }