CVE-2026-42006

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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. 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A remote attacker can exploit this vulnerability by sending excessive open braces over the Internet Message Access Protocol (IMAP), leading to uncontrolled memory usage. 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"https://access.redhat.com/errata/RHSA-2026:46379", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:46381", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:44373", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:44357", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:44355", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:41905", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}], "workarounds": [{"lang": "en", "value": "To mitigate this issue, administrators can configure the `vsz_limit` setting for the Dovecot IMAP process to a lower value. This limits the virtual memory size available to the IMAP process, preventing excessive memory consumption.\n\nExample configuration in `/etc/dovecot/conf.d/10-master.conf`:\n```\nservice imap {\n vsz_limit = 256M\n}\n```\nAfter modifying the configuration, restart the Dovecot service for the changes to take effect.\n```bash\nsystemctl restart dovecot\n```\nSetting `vsz_limit` too low may impact legitimate IMAP operations. \n\n*Restarting the dovecot service will temporarily interrupt mail services."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in Dovecot. A remote attacker can exploit this vulnerability by sending excessive open braces over the Internet Message Access Protocol (IMAP), leading to uncontrolled memory usage. This can cause the affected system to consume memory up to its configured limit, resulting in a Denial of Service (DoS)."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-08-03T12:05:50.626Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-42006", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-12T15:40:29.845540Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-12T15:40:33.391Z"}}], "cna": {"source": {"defect": "DOV-9138", "discovery": "EXTERNAL"}, "metrics": [{"format": "CVSS", "cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"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"}], "references": [{"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json", "tags": ["vendor-advisory"]}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-400", "description": "Uncontrolled Resource Consumption"}]}], "providerMetadata": {"orgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981", "shortName": "OX", "dateUpdated": "2026-05-12T13:39:06.099Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42006", "state": "PUBLISHED", "dateUpdated": "2026-08-03T12:05:50.626Z", "dateReserved": "2026-04-23T11:15:21.199Z", "assignerOrgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981", "datePublished": "2026-05-12T13:28:46.922Z", "assignerShortName": "OX"}, "dataVersion": "5.2"}

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["cpe:/o:redhat:enterprise_linux:6"], "defaultStatus": "unknown", "packageName": "dovecot", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*", "matchCriteriaId": "86CE1F3B-DF73-431A-9EC0-491E8969A187", "versionEndExcluding": "2.4.4", "vulnerable": true}, {"criteria": "cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*", "matchCriteriaId": "28C2DD58-A4B0-4F2C-BC60-F30F380251BC", "versionEndExcluding": "3.1.5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-42006", "lastModified": "2026-10-26T18:10:00.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "security@open-xchange.com", "type": "Secondary"}, {"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42006", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-12T15:40:29.845540Z", "version": "2.0.3"}}]}, "published": "2026-05-12T14:17:04.703", "references": [{"source": "security@open-xchange.com", "tags": ["Issue Tracking"], "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "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"}], "sourceIdentifier": "security@open-xchange.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security@open-xchange.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-770"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.0.5]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.1.4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.4.3]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "OX Dovecot Pro", "source": "cna", "vendor": "Open-Xchange GmbH"}, "product": "ox_dovecot_pro", "vendor": "open-xchange"}], "created": "2026-05-12T15:30:18.461362+00:00", "updated": "2026-08-14T04:00:12.058767+00:00", "vendors": ["open-xchange", "open-xchange$PRODUCT$ox_dovecot_pro"]}