CVE-2026-42006

{"id": "CVE-2026-42006", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42006", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-12T15:40:29.845540Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@open-xchange.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@open-xchange.com", "affectedData": [{"vendor": "Open-Xchange GmbH", "modules": ["core"], "product": "OX Dovecot Pro", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "3.0.5"}, {"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "3.1.4"}, {"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "2.4.3"}], "defaultStatus": "unaffected"}]}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "affectedData": [{"cpes": ["cpe:/o:redhat:enterprise_linux:10.2"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "versions": [{"status": "unaffected", "version": "1:2.3.21-19.el10_2.1", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux_eus:10.0"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "versions": [{"status": "unaffected", "version": "1:2.3.21-16.el10_0.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:rhel_els:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "versions": [{"status": "unaffected", "version": "1:2.2.36-8.el7_9.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "versions": [{"status": "unaffected", "version": "1:2.3.16-8.el8_10", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_aus:8.4"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "versions": [{"status": "unaffected", "version": "1:2.3.8-9.el8_4.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_eus_long_life:8.4"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On", "versions": [{"status": "unaffected", "version": "1:2.3.8-9.el8_4.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_aus:8.6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "versions": [{"status": "unaffected", "version": "1:2.3.16-2.el8_6.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_eus_long_life:8.6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On", "versions": [{"status": "unaffected", "version": "1:2.3.16-2.el8_6.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_tus:8.8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service", "versions": [{"status": "unaffected", "version": "1:2.3.16-3.el8_8.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_e4s:8.8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions", "versions": [{"status": "unaffected", "version": "1:2.3.16-3.el8_8.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "versions": [{"status": "unaffected", "version": "1:2.3.16-18.el9_8.1", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_e4s:9.2"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions", "versions": [{"status": "unaffected", "version": "1:2.3.16-8.el9_2.3", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_e4s:9.4"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions", "versions": [{"status": "unaffected", "version": "1:2.3.16-11.el9_4.3", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_eus:9.6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.6 Extended Update Support", "versions": [{"status": "unaffected", "version": "1:2.3.16-15.el9_6.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "dovecot", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unknown"}]}], "published": "2026-05-12T14:17:04.703", "references": [{"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json", "tags": ["Issue Tracking"], "source": "security@open-xchange.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:41905", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:41988", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:42091", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:44355", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:44357", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:44373", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:46379", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:46380", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:46381", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:46532", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:49513", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-42006", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476476", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42006.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security@open-xchange.com", "description": [{"lang": "en", "value": "CWE-400"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known."}, {"lang": "es", "value": "Un atacante puede causar un uso descontrolado de memoria con un uso excesivo de llaves a trav\u00e9s de IMAP. La soluci\u00f3n en CVE-2026-27857 fue incompleta, solo bloqueando una forma de hacer esto, por lo que a\u00fan quedaba otra forma abierta. En particular, la soluci\u00f3n era para llaves de cierre, pero a\u00fan se pod\u00edan usar llaves de apertura para eludir el l\u00edmite. Usando un uso excesivo de llaves, el atacante puede causar un uso de memoria hasta el l\u00edmite de memoria configurado. Instale la versi\u00f3n corregida, o configure vsz_limit para el proceso imap a un valor bajo. No se conocen exploits disponibles p\u00fablicamente."}], "lastModified": "2026-10-26T18:10:00.173", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "86CE1F3B-DF73-431A-9EC0-491E8969A187", "versionEndExcluding": "2.4.4"}, {"criteria": "cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*", "vulnerable": true, "matchCriteriaId": "28C2DD58-A4B0-4F2C-BC60-F30F380251BC", "versionEndExcluding": "3.1.5"}], "operator": "OR"}]}], "sourceIdentifier": "security@open-xchange.com"}