CVE-2018-6551: GNU Glibc

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

The malloc implementation in the GNU C Library (aka glibc or libc6), from version 2.24 to 2.26 on powerpc, and only in version 2.26 on i386, did not properly handle malloc calls with arguments close to SIZE_MAX and could return a pointer to a heap region that is smaller than requested, eventually leading to heap corruption.

Affected products

• GNU Glibc: from 2.24, up to and including 2.26

Published 2018-02-02. Last modified 2026-06-17.