PT-2026-132406

CVE-2026-118769

Published

2026-10-29

Updated

2026-10-29

Description by

CVSS 4.0

9.2

Critical

MetricsAV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Botan versions 2.1.0 through 3.12.x

Description The Botan C API function botan block cipher block size() converts a size t block size to an int without performing a bounds check. In applications that accept external algorithm parameter strings and utilize the Foreign Function Interface (FFI) raw Electronic Codebook (ECB) mode, an attacker can select the variable-block-size Lion cipher. This causes the reported size to be truncated, leading the caller to allocate insufficient memory, which subsequently results in memory corruption during block processing. The C++ API and standard C API modes, such as Cipher Block Chaining (CBC) and Counter (CTR), are not affected.

Recommendations Update to version 3.13.0.

Exploitability

Exploit

Fix

Impacts

Researchers

Fcasal

Vendors

Affected products

Weakness enumeration

CWE-787: Out-of-bounds Write

CWE-125: Out-of-bounds Read