CVE-2017-12814: Perl

Critical severity, CVSS 9.8. EPSS: 7% chance of exploitation in the next 30 days.

Stack-based buffer overflow in the CPerlHost::Add method in win32/perlhost.h in Perl before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 on Windows allows attackers to execute arbitrary code via a long environment variable.

Affected products

• Perl Perl: up to and including 5.24.2; version 5.26.0 only

Published 2017-09-28. Last modified 2026-06-17.