CVE-2025-13151: GNU LIBTASN1

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.

Affected products

• GNU LIBTASN1: version 4.20.0 only

Published 2026-01-07. Last modified 2026-06-17.