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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory."}], "id": "CVE-2026-40687", "lastModified": "2026-04-30T22:16:25.923", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.8, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 2.5, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-04-30T22:16:25.923", "references": [{"source": "cve@mitre.org", "url": "https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/CVE-2025-40687.txt"}, {"source": "cve@mitre.org", "url": "https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.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-909"}], "source": "cve@mitre.org", "type": "Primary"}]}

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