CVE-2017-17426: GNU Glibc

High severity, CVSS 8.1. EPSS: 1.6% chance of exploitation in the next 30 days.

The malloc function in the GNU C Library (aka glibc or libc6) 2.26 could return a memory block that is too small if an attempt is made to allocate an object whose size is close to SIZE_MAX, potentially leading to a subsequent heap overflow. This occurs because the per-thread cache (aka tcache) feature enables a code path that lacks an integer overflow check.

Affected products

• GNU Glibc: version 2.26 only

Published 2017-12-05. Last modified 2026-06-17.