9.2
Critical
CVE-2026-118769 Botan is a C++ cryptography library
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Botan 2.1 | 2.1.0 → < 3.13.0 | 3.13.0 |
Other CVEs of Botan
The 17 CVEs of Botan →
CVE-2026-104267
Botan: scrypt V-buffer heap overflow on 32-bit from constructor-accepted parameters
4.1
Medium
CVE-2026-48057
Botan: directoryName nameConstraint bypass via multi-AVA RDN flattening in matches_dn
2.1
Low
CVE-2026-118768
Botan is a C++ cryptography library
5.9
Medium
CVE-2026-118767
Botan is a C++ cryptography library
4.8
Medium