CVE-2009-4881: GNU Glibc

Medium severity, CVSS 5.0. EPSS: 2% chance of exploitation in the next 30 days.

Integer overflow in the __vstrfmon_l function in stdlib/strfmon_l.c in the strfmon implementation in the GNU C Library (aka glibc or libc6) before 2.10.1 allows context-dependent attackers to cause a denial of service (application crash) via a crafted format string, as demonstrated by the %99999999999999999999n string, a related issue to CVE-2008-1391.

Affected products

• GNU Glibc: up to and including 2.9; version 1.00 only; version 1.01 only; version 1.02 only; version 1.03 only; version 1.04 only; …

Published 2010-06-01. Last modified 2026-06-16.