/ 
YAML-Syck-0.02
/ YAML::Syck
Security Advisories (2)
CVE-2025-11683 (2025-10-16)

YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values. There is no indication that the issue leads to accessing memory outside that allocated to the module.

CVE-2026-4177 (2026-03-16)

YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter. The heap overflow occurs when class names exceed the initial 512-byte allocation. The base64 decoder could read past the buffer end on trailing newlines. strtok mutated n->type_id in place, corrupting shared node data. A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.

NAME

YAML::Syck - Fast, lightweight YAML loader and dumper

VERSION

This document describes version 0.02 of YAML::Syck, released December 26, 2005.

SYNOPSIS

use YAML::Syck;

$data = Load($yaml);
$yaml = Dump($data);

DESCRIPTION

This module provides a Perl interface to the libsyck data serialization library. It exports the Dump and Load functions for converting Perl data structures to YAML strings, and the other way around.

CAVEATS

The current implementation bundles libsyck source code; if your system has a side-wide shared libsyck, it will not be used.

This module is not currently pluggable to the new YAML (0.50+) framework, but that's expected to change in the future.

Dumping code, glob, scalar and blessed references are currently broken.

SEE ALSO

YAML

AUTHORS

Audrey Tang <autrijus@autrijus.org>

COPYRIGHT

Copyright by Audrey Tang <autrijus@autrijus.org>.

The libsyck code bundled with this library by why the lucky stiff, under a BSD-style license. See the COPYING file for details.

The Storable.xs code bundled with this library is written by Raphael Manfredi and maintained by perl5-porters, under the same license as Perl.

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

See http://www.perl.com/perl/misc/Artistic.html