Vulnerability Description
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 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/randombit/botan/commit/5a4ac737e72e18a08eca848049e3dd38571c73
- https://github.com/randombit/botan/pull/5814
- https://github.com/randombit/botan/security/advisories/GHSA-w8gj-5xrm-gvrp
FAQ
What is CVE-2026-118767?
CVE-2026-118767 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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,...
How severe is CVE-2026-118767?
CVE-2026-118767 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-118767?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.