CVE-2026-118769
CriticalCVSS 9.2Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
In the Botan C++ cryptography library, the 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 FFI raw ECB mode, an attacker can select the variable-block-size Lion cipher, causing the reported size to be truncated, insufficient memory allocation, and later memory corruption. The issue is fixed in version 3.13.0.
Risk Assessment
Potential memory corruption and possible code execution in applications using the Botan C API in ECB mode with user-controlled algorithm parameters. This affects confidentiality, integrity, and availability of the service.
Recommendation
Update Botan to version 3.13.0 or later. Until patched, avoid passing untrusted algorithm parameters to ECB mode via the C API.
Other vulnerabilities in Botan
See all- CVE-2015-7825High
Botan before 1.11.22 improperly validates certificate paths, allowing remote attackers to cause a denial of service via a certificate with a loop in the certificate chain.
- CVE-2015-7824High
Botan versions 1.11.x before 1.11.22 are vulnerable to a padding-oracle attack that allows remote attackers to decrypt TLS ciphertext data using CBC ciphersuites.
- CVE-2016-2850High
Botan versions 1.11.x before 1.11.29 do not enforce TLS policy for signature algorithms and ECC curves, allowing remote attackers to conduct downgrade attacks.
- CVE-2016-2849High
Botan before 1.10.13 and 1.11.x before 1.11.29 do not use a constant-time algorithm to perform a modular inverse on the signature nonce k, which might allow remote attackers to obtain ECDSA secret keys via a timing side-channel attack.
- CVE-2016-2194High
The ressol function in Botan before 1.10.11 and 1.11.x before 1.11.27 allows remote attackers to cause a denial of service (infinite loop) via unspecified input to the OS2ECP function, related to a composite modulus.
- CVE-2015-7827High
Botan before 1.10.13 and 1.11.x before 1.11.22 makes it easier for remote attackers to conduct million-message attacks by measuring time differences related to decoding of PKCS#1 padding.
- CVE-2015-5727High
The BER decoder in Botan 1.10.x before 1.10.10 and 1.11.x before 1.11.19 allows remote attackers to cause a denial of service (memory consumption) via unspecified vectors, related to a length field.
- CVE-2015-5726High
The BER decoder in Botan versions 0.10.x before 1.10.10 and 1.11.x before 1.11.19 allows remote attackers to cause an application crash via an empty BIT STRING in ASN.1 data.
- CVE-2014-9742High
The Miller-Rabin primality check in Botan before 1.10.8 and 1.11.x before 1.11.9 improperly uses a single random base, making it easier for remote attackers to defeat cryptographic protection mechanisms via a DH group.
- CVE-2026-34582Critical
In Botan's TLS 1.3 implementation before version 3.11.1, ApplicationData records can be processed before the Finished message is received. This allows a client to bypass certificate-based authentication.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS