CVE-2011-1659: Integer overflow in posix/fnmatch.c in the GNU C Library (aka glibc or libc6) 2.13 and earlier allows conte...

Security readout for executives and security teams

CVE-2011-1659 is a denial-of-service flaw in glibc's fnmatch pattern-matching code. On systems using glibc 2.13 or earlier, a long UTF-8 string combined with a crafted pattern can crash an application that reaches this code path. Business risk is primarily service interruption in legacy Linux-based systems. Exposure is most likely in unsupported or long-lived Linux distributions, appliances, virtualization platforms, or embedded products still carrying glibc/libc6 2.13 or earlier. Modern supported Linux platforms are less likely to remain affected, but vendor backport status must be verified from package advisories. Treat this as a legacy platform availability risk. It is not evidenced as actively exploited, but glibc is foundational software, so affected unsupported systems can create avoidable outage exposure. Prioritize confirmation and vendor patching during normal vulnerability remediation cycles. Mitigation focus: Identify systems running glibc/libc6 2.13 or earlier.; Apply vendor-supported glibc/libc6 security updates where available.; Check vendor advisories for backported fixes on older distributions..

Prepared

Jun 24, 2026, 13:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.