Vulnerability Description
Botan is a C++ cryptography library. From 2.1.0 until 3.13.0, the Botan C API function botan_block_cipher_block_size converted a size_t block size to int without a bounds check. In an application that accepts external algorithm parameter strings and uses the FFI raw ECB mode, an attacker can select the variable-block-size Lion cipher so that the reported size is truncated, the caller allocates insufficient memory, and later block processing causes memory corruption. The C++ API and normally used C API modes such as CBC and CTR are unaffected. This issue is fixed in version 3.13.0.
Related Weaknesses (CWE)
References
- https://github.com/randombit/botan/commit/c6089ab7fab616517d56c447c93e13a5c57a0a
- https://github.com/randombit/botan/pull/5805
- https://github.com/randombit/botan/security/advisories/GHSA-c68p-822g-jfvr
FAQ
What is CVE-2026-118769?
CVE-2026-118769 is a documented vulnerability. Botan is a C++ cryptography library. From 2.1.0 until 3.13.0, the Botan C API function botan_block_cipher_block_size converted a size_t block size to int without a bounds check. In an application that...
How severe is CVE-2026-118769?
CVSS scoring is not yet available for CVE-2026-118769. Check NVD for updates.
Is there a patch for CVE-2026-118769?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.