{"id":"CVE-2026-40687","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-40687","generatedAt":"2026-10-28T08:11:18.046Z","title":"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.","description":"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.","published":"2026-04-30T22:16:26.000Z","lastModified":"2026-06-17T10:45:35.000Z","status":"Analyzed","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},"cwe":["CWE-909"],"affected":["exim/exim"],"epss":{"score":0.00373,"percentile":0.31025,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://exim.org/static/doc/security/CVE-2026-40687.txt","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.openwall.com/lists/oss-security/2026/04/30/21","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-40687","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}