CVE-2026-118767 (GCVE-0-2026-118767)

Vulnerability from cvelistv5 – Published: 2026-10-29 17:17 – Updated: 2026-10-30 17:12
VLAI
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 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.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 15:20 UTC
CWE
  • CWE-158 - Improper Neutralization of Null Byte or NUL Character
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8129 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
randombit botan Affected: >= 1.11.22, < 3.13.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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