{"id":"CVE-2026-87732","title":"An issue was discovered in the mirage-crypto package before 2.2.0 for OCaml","summary":"An issue was discovered in the mirage-crypto package before 2.2.0 for OCaml. The AES.GCM.authenticate_decrypt_into and Chacha20.authenticate_decrypt_into functions write the decrypted plaintext into a caller-provided buffer and only then…","severity":"medium","cvss":6.2,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-347"],"vendor":"OCaml","product":"mirage-crypto","affected":["mirage-crypto < 2.2.0"],"published":"2026-09-09","updated":"2026-09-09","sourceUpdated":"2026-09-09T16:04:24.933","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87732","references":[{"url":"https://osv.dev/vulnerability/OSEC-2026-12","label":"cve@mitre.org"},{"url":"https://osv.dev/vulnerability/OSEC-2026-12","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-09T13:11:34.596764Z"},"ingestedAt":"2026-09-09T05:00:01.767Z","epss":0.00077,"epssPercentile":0.00131,"slug":"CVE-2026-87732","body":"## Overview\n\nAn issue was discovered in the mirage-crypto package before 2.2.0 for OCaml. The AES.GCM.authenticate_decrypt_into and Chacha20.authenticate_decrypt_into functions write the decrypted plaintext into a caller-provided buffer and only then compares the tag. On a forged tag, the functions returns false, but the destination buffer already holds the full plaintext.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":34.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":17232,"id":"CVE-2026-87732","ts":1788963130737,"field":"exploit_available","old":"false","new":"true"}]}