Medium 4.8Published Oct 29, 2026

CVE-2026-118767Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs

Updated under an hour ago (Oct 30, 2026, 5:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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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: 4.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-158
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Received
Record last updated: Oct 29, 2026
First seen by InfoSec Signals: Oct 29, 2026

Affected products

Affected products

randombit botan randombit:botan (from the name)	from 1.11.22, < 3.13.0	CNA record

References

References

https://github.com/randombit/botan/security/advisories/GHSA-w8gj-5xrm-gvrp	x-refsource-confirm
https://github.com/randombit/botan/pull/5814	x-refsource-misc
https://github.com/randombit/botan/commit/5a4ac737e72e18a08eca848049e3dd38571c73b4	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.