/ 
perl-5.45.1
⭐ Starred 2013 / valgrindpp.pl
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

valgrindpp.pl - A post processor for make test.valgrind

SYNOPSIS

valgrindpp.pl [--dir=dir] [--frames=number] [--hide=identifier] [--lines] [--output-file=file] [--tests] [--top=number] [--verbose]

DESCRIPTION

valgrindpp.pl is a post processor for .valgrind files created during make test.valgrind. It collects all these files, extracts most of the information and produces a significantly shorter summary of all detected memory access errors and memory leaks.

OPTIONS

--dir=dir

Recursively process .valgrind files in dir. If this options is not given, valgrindpp.pl must be run from either the perl source or the t directory and will process all .valgrind files within the distribution.

--frames=number

Number of stack frames within the perl source code to consider when distinguishing between memory leak sources. Increasing this value will give you a longer backtrace, while decreasing the number will show you fewer sources for memory leaks. The default is 3 frames.

--hide=identifier

Hide all memory leaks that have identifier in their backtrace. Useful if you want to hide leaks from functions that are known to have lots of memory leaks. identifier can also be a regular expression, in which case all leaks with symbols matching the expression are hidden. Can be given multiple times.

--lines

Show line numbers for stack frames. This is useful for further increasing the error/leak resolution, but makes it harder to compare different reports using diff.

--output-file=file

Redirect the output into file. If this option is not given, the output goes to stdout.

--tests

List all tests that trigger memory access errors or memory leaks explicitly instead of only printing a count.

--top=number

List the top number test scripts for memory access errors and memory leaks. Set to 0 for no top-n statistics.

--verbose

Increase verbosity level. Can be given multiple times.

COPYRIGHT

Copyright 2003 by Marcus Holland-Moritz <mhx@cpan.org>.

This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.