CVE-2026-118767 Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118767?
CVE-2026-118767 is a medium-severity vulnerability in randombit botan, published on 29 Oct 2026.
Official 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.
Weakness: CWE-158
Which versions are affected by CVE-2026-118767?
How do I fix CVE-2026-118767?
No fix has been published for CVE-2026-118767 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118767 being exploited?
There is no known exploitation of CVE-2026-118767 in the wild and no public exploit code.
Sources
Also known as GHSA-w8gj-5xrm-gvrp.