/ 
perl-5.44.0
⭐ Starred 2013 / PerlIO::via::QuotedPrint
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

PerlIO::via::QuotedPrint - PerlIO layer for quoted-printable strings

SYNOPSIS

use PerlIO::via::QuotedPrint;

open(my $in, '<:via(QuotedPrint)', 'file.qp') or
    die "Can't open file.qp for reading: $!\n";

open(my $out, '>:via(QuotedPrint)', 'file.qp') or
    die "Can't open file.qp for writing: $!\n";

DESCRIPTION

This module implements a PerlIO layer that works on files encoded in the quoted-printable format. It will decode from quoted-printable while reading from a handle, and it will encode as quoted-printable while writing to a handle.

EXPORTS

None.

KNOWN BUGS

None.

FEEDBACK

Patches, bug reports, suggestions or any other feedback is welcome.

Patches can be sent as GitHub pull requests at https://github.com/steve-m-hay/PerlIO-via-QuotedPrint/pulls.

Bug reports and suggestions can be made on the CPAN Request Tracker at https://rt.cpan.org/Public/Bug/Report.html?Queue=PerlIO-via-QuotedPrint.

Currently active requests on the CPAN Request Tracker can be viewed at https://rt.cpan.org/Public/Dist/Display.html?Status=Active;Queue=PerlIO-via-QuotedPrint.

Please test this distribution. See CPAN Testers Reports at https://www.cpantesters.org/ for details of how to get involved.

Previous test results on CPAN Testers Reports can be viewed at https://www.cpantesters.org/distro/P/PerlIO-via-QuotedPrint.html.

Please rate this distribution on CPAN Ratings at https://cpanratings.perl.org/rate/?distribution=PerlIO-via-QuotedPrint.

SEE ALSO

PerlIO::via, MIME::QuotedPrint.

ACKNOWLEDGEMENTS

Based on an example in the standard library module MIME::QuotedPrint in Perl (version 5.8.0).

AVAILABILITY

The latest version of this module is available from CPAN (see "CPAN" in perlmodlib for details) at

https://metacpan.org/release/PerlIO-via-QuotedPrint or

https://www.cpan.org/authors/id/S/SH/SHAY/ or

https://www.cpan.org/modules/by-module/PerlIO/.

The latest source code is available from GitHub at https://github.com/steve-m-hay/PerlIO-via-QuotedPrint.

INSTALLATION

See the INSTALL file.

AUTHOR

Elizabeth Mattijsen <liz@dijkmat.nl>.

Steve Hay <shay@cpan.org> is now maintaining PerlIO::via::QuotedPrint as of version 0.08.

COPYRIGHT

Copyright (C) 2002-2004, 2012 Elizabeth Mattijsen. All rights reserved.

Copyright (C) 2015, 2020 Steve Hay. All rights reserved.

LICENCE

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself, i.e. under the terms of either the GNU General Public License or the Artistic License, as specified in the LICENCE file.

VERSION

Version 0.10

DATE

22 May 2022

HISTORY

See the Changes file.