CVE-2026-118769 (GCVE-0-2026-118769)

Vulnerability from cvelistv5 – Published: 2026-10-29 17:22 – Updated: 2026-10-29 20:21
VLAI
Title
Botan: Integer overflow when reporting block size in FFI can cause memory corruption
Summary
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.
Severity
9.2 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-29 20:20 UTC
CWE
  • CWE-125 - Out-of-bounds Read
  • CWE-681 - Incorrect Conversion between Numeric Types
  • CWE-787 - Out-of-bounds Write
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8129 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
randombit botan Affected: >= 2.1.0, < 3.13.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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