CVE-2026-118767
Medium
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.
SeverityMedium
CVSS4.8
Exploit probability—
ProductRandombit Botan
PublishedOct 29, 2026
First seenNov 4, 2026
Weakness typeCWE-158CWE-158
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| randombit botan | >= 1.11.22, < 3.13.0 | — |
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