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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \\ skipping."}], "id": "CVE-2026-40685", "lastModified": "2026-05-01T02:16:03.990", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-04-30T22:16:25.633", "references": [{"source": "cve@mitre.org", "url": "https://code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/CVE-2026-40685.txt"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.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": "Secondary"}]}

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