{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-61908", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-09-09T19:44:57.533Z", "dateReserved": "2026-07-13T00:00:00.000Z", "datePublished": "2026-09-09T00:00:00.000Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Cyrus IMAP", "vendor": "cyrusimap", "versions": [{"lessThan": "3.8.8", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "3.10.4", "status": "affected", "version": "3.9.0", "versionType": "semver"}, {"lessThan": "3.12.4", "status": "affected", "version": "3.11.0", "versionType": "semver"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-09-09T19:44:57.533Z"}, "references": [{"url": "https://cyrusimap.org"}, {"url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html"}, {"url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html"}, {"url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html"}], "x_generator": {"engine": "enrichogram 0.0.1"}, "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.8.8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9.0", "versionEndExcluding": "3.10.4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11.0", "versionEndExcluding": "3.12.4"}]}]}]}}, "dataVersion": "5.2"}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Cyrus IMAP", "vendor": "cyrusimap", "versions": [{"lessThan": "3.8.8", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "3.10.4", "status": "affected", "version": "3.9.0", "versionType": "semver"}, {"lessThan": "3.12.4", "status": "affected", "version": "3.11.0", "versionType": "semver"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory."}], "id": "CVE-2026-61908", "lastModified": "2026-09-09T20:22:32.663", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-09-09T20:18:36.383", "references": [{"source": "[email protected]", "url": "https://cyrusimap.org"}, {"source": "[email protected]", "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html"}, {"source": "[email protected]", "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html"}, {"source": "[email protected]", "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "cyrus-imapd: cyrus-imapd: JMAP email-header blob ID out-of-bounds index", "id": "2526304", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526304"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in cyrus-imapd. An authenticated user could exploit this vulnerability by attempting to download a specially crafted JMAP (JSON Meta Application Protocol) blob ID. This action could lead to reading beyond the intended memory boundary, potentially exposing sensitive information from adjacent heap memory."], "mitigation": {"lang": "en:us", "value": "To reduce the attack surface, restrict network access to the `cyrus-imapd` service to trusted clients or internal networks using firewall rules. For example, using `firewalld`:\n`sudo firewall-cmd --permanent --add-rich-rule='rule family=\"ipv4\" source address=\"<TRUSTED_NETWORK>\" port port=\"imap\" protocol=\"tcp\" accept'`\n`sudo firewall-cmd --reload`\nThis may impact legitimate users who require remote access to the IMAP service. A service restart may be required for changes to take full effect."}, "name": "CVE-2026-61908", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-10T07:41:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-61908\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-61908"], "threat_severity": "Moderate"}

{"created": "2026-09-09T22:15:17.108081+00:00", "title": "Out\u2011of\u2011Bounds Read via JMAP Blob ID in Cyrus IMAP", "updated": "2026-09-09T22:15:17.108087+00:00", "vendors": []}