{"id":"CVE-2026-118767","title":"Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs","summary":"Botan is a C++ cryptography library. From 1.11.22 until 3.13.0, Botan's Python binding converted Python strings containing U+0000 to const char* values without consistently rejecting the embedded NUL, causing bcrypt and check_bcrypt to p…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-158"],"vendor":"randombit","product":"botan","affected":["botan >= 1.11.22, < 3.13.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-30T15:20:33.590831Z"},"published":"2026-10-29","updated":"2026-10-30","sourceUpdated":"2026-10-30T17:12:36.136Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118767","references":[{"url":"https://github.com/randombit/botan/security/advisories/GHSA-w8gj-5xrm-gvrp","label":"https://github.com/randombit/botan/security/advisories/GHSA-w8gj-5xrm-gvrp"},{"url":"https://github.com/randombit/botan/pull/5814","label":"https://github.com/randombit/botan/pull/5814"},{"url":"https://github.com/randombit/botan/commit/5a4ac737e72e18a08eca848049e3dd38571c73b4","label":"https://github.com/randombit/botan/commit/5a4ac737e72e18a08eca848049e3dd38571c73b4"}],"tags":["cve.org"],"epss":0.00217,"epssPercentile":0.12326,"ingestedAt":"2026-11-05T16:24:31.135Z","slug":"CVE-2026-118767","body":"## Overview\n\nBotan is a C++ cryptography library. From 1.11.22 until 3.13.0, Botan's Python binding converted Python strings containing U+0000 to const char* values without consistently rejecting the embedded NUL, causing bcrypt and check_bcrypt to process only the prefix before the NUL. Applications could validate a longer password but hash a shorter effective value, allowing application password-policy bypass; scrypt and argon2 are unaffected. This issue is fixed in version 3.13.0.\n\n## Affected\n\n- `botan >= 1.11.22, < 3.13.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}