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perl-5.45.1
⭐ Starred 2013 / Pod::Html::Util
Security Advisories (1)
CVE-2026-15534 (2026-08-09)

Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex engine's superlinear cache holds one bit per subject position for each participating WHILEM node, so the bit count is the subject length plus one times the number of nodes. Nothing checks that product for positive overflow of the signed 32-bit count: a 286331153 byte subject matched against a pattern with 15 participating nodes stores the count as 14, leaving a two byte cache. The cache is then indexed from the real match position and node number, so reads go past the end of the allocation, and on failure CACHEsayNO sets a bit past it. A caller that matches an attacker controlled subject of this size against a pattern of this shape can crash the process or corrupt heap memory.

NAME

Pod::Html::Util - helper functions for Pod-Html

SUBROUTINES

Note: While these functions are importable on request from Pod::Html::Util, they are specifically intended for use within (a) the Pod-Html distribution (modules and test programs) shipped as part of the Perl 5 core and (b) other parts of the core such as the installhtml program. These functions may be modified or relocated within the core distribution -- or removed entirely therefrom -- as the core's needs evolve. Hence, you should not rely on these functions in situations other than those just described.

process_command_line()

Process command-line switches (options). Returns a reference to a hash. Will provide usage message if --help switch is present or if parameters are invalid.

Calling this subroutine may modify @ARGV.

usage()

Display customary Pod::Html usage information on STDERR.

unixify()

Ensure that Pod::Html's internals and tests handle paths consistently across Unix, Windows and VMS.

relativize_url()

Convert an absolute URL to one relative to a base URL. Assumes both end in a filename.

html_escape()

Make text safe for HTML.

htmlify()

htmlify($heading);

Converts a pod section specification to a suitable section specification for HTML. Note that we keep spaces and special characters except ", ? (Netscape problem) and the hyphen (writer's problem...).

anchorify()

anchorify(@heading);

Similar to htmlify(), but turns non-alphanumerics into underscores. Note that anchorify() is not exported by default.

trim_leading_whitespace()

Remove any level of indentation (spaces or tabs) from each code block consistently. Adapted from: https://metacpan.org/source/HAARG/MetaCPAN-Pod-XHTML-0.002001/lib/Pod/Simple/Role/StripVerbatimIndent.pm