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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present (malformed UTF-8 header data). Information might be divulged within an error message produced during handling of an unrelated e-mail message."}], "id": "CVE-2026-40686", "lastModified": "2026-05-01T02:16:04.107", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-04-30T22:16:25.787", "references": [{"source": "cve@mitre.org", "url": "https://code.exim.org/exim/exim/commit/f2570bde16fb4d4a1242ff363a4c4eecf6372efc"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/CVE-2026-40686.txt"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40686.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-125"}], "source": "cve@mitre.org", "type": "Secondary"}]}

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