Vulnerability in Randombit Botan
CVE-2026-118767
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.
Published .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Randombit Botan — versions >= 1.11.22, < 3.13.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-118767?
- CVE-2026-118767 is a medium-severity vulnerability in Randombit Botan, classified under CWE-158. CVSS score: 4.8/10. Published 2026-10-29.
- How severe is CVE-2026-118767?
- Medium severity. CVSS v3 base score is 4.8 out of 10.