CVE-2026-118767
Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-158 |
| Vendor | randombit |
| Product | botan |
| Published | Oct 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
randombit / botan
>= 1.11.22, < 3.13.0