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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing."}], "id": "CVE-2026-40684", "lastModified": "2026-04-30T22:16:25.477", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-04-30T22:16:25.477", "references": [{"source": "cve@mitre.org", "url": "https://code.exim.org/exim/exim/commit/628bbaca7672748d941a12e7cd5f0122a4e18c81"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/CVE-2025-40684.txt"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40684.assessment"}, {"source": "cve@mitre.org", "url": "https://www.openwall.com/lists/oss-security/2026/04/30/21"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-684"}], "source": "cve@mitre.org", "type": "Primary"}]}

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