CVE WatchOct 29, 2026

CVE-2026-118769

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 bloc

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

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0-100

Published: Oct 29, 2026 · Last modified: Oct 29, 2026 · CWE-125 · CWE-681 · CWE-787

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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