CVE-2011-1487: The (1) lc, (2) lcfirst, (3) uc, and (4) ucfirst functions in Perl 5.10.x, 5.11.x, and 5.12.x through 5.12....

Security readout for executives and security teams

This flaw affects Perl’s taint protection, a safety feature used to track untrusted input. Certain case-conversion functions could return data without preserving the taint marker, potentially weakening input-safety checks in applications that depend on taint mode. Exposure is most likely in legacy systems running affected Perl versions and applications that rely on taint mode for untrusted input handling. General Perl use without taint-mode trust decisions is less directly exposed. Treat this as a targeted legacy exposure issue, not a broad emergency. Prioritize systems where Perl taint mode protects sensitive command, file, or input-processing paths, then patch through normal vulnerability maintenance. Mitigation focus: Inventory Perl runtimes for the affected version ranges.; Apply vendor Perl updates from the relevant distribution advisory.; Review taint-mode applications using lc, lcfirst, uc, or ucfirst on untrusted input..

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.