{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-45185", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-05-13T01:36:58.116Z", "dateReserved": "2026-05-10T00:00:00.000Z", "datePublished": "2026-05-12T00:00:00.000Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Exim", "vendor": "Exim", "versions": [{"lessThan": "4.99.3", "status": "affected", "version": "4.97", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-416", "description": "CWE-416 Use After Free", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-05-12T20:08:08.207Z"}, "references": [{"url": "https://exim.org"}, {"url": "https://code.exim.org/exim/wiki/wiki/EximSecurity"}, {"url": "https://exim.org/static/doc/security/CVE-2026-45185.txt"}, {"url": "https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim"}, {"url": "https://news.ycombinator.com/item?id=48111748"}, {"url": "https://www.openwall.com/lists/oss-security/2026/05/12/4"}, {"url": "https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/"}], "x_generator": {"engine": "enrichogram 0.0.1"}, "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.97", "versionEndExcluding": "4.99.3"}]}]}]}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/05/12/25"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-05-13T01:36:58.116Z"}}]}, "dataVersion": "5.2"}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code."}], "id": "CVE-2026-45185", "lastModified": "2026-05-12T21:16:16.807", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-05-12T20:16:46.137", "references": [{"source": "cve@mitre.org", "url": "https://code.exim.org/exim/wiki/wiki/EximSecurity"}, {"source": "cve@mitre.org", "url": "https://exim.org"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/CVE-2026-45185.txt"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/"}, {"source": "cve@mitre.org", "url": "https://news.ycombinator.com/item?id=48111748"}, {"source": "cve@mitre.org", "url": "https://www.openwall.com/lists/oss-security/2026/05/12/4"}, {"source": "cve@mitre.org", "url": "https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "cve@mitre.org", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.97,4.99.3)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Exim", "source": "cna", "vendor": "Exim"}, "product": "exim", "vendor": "exim"}], "created": "2026-05-12T22:00:22.680177+00:00", "title": "Use\u2011After\u2011Free Leading to Remote Code Execution in BDAT Parsing of Exim", "updated": "2026-05-13T00:15:27.182520+00:00", "vendors": ["exim", "exim$PRODUCT$exim"]}