CVE-2025-11683

libyaml-syck-perl: YAML::Syck versions before 1.36 for Perl has missing null-terminators whichcauses out-of-bounds read and potential in...

CVE-2025-11683 is fixed in 4 products on 1 platform, first by libyaml-syck-perl 1.29-1ubuntu0.18.04.1~esm1, released October 15, 2025. It is not reported as exploited. Patch Radar priority: Routine.

Routine
CVSS
6.5
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0031
23rd percentile

YAML::Syck versions before 1.36 for Perl has missing null-terminators whichcauses out-of-bounds read and potential information disclosureMissing null terminators in token.c leads to but-of-bounds read whichallows adjacent variable to be readThe issue is seen with complex YAML files with a hash of all keys and emptyvalues.  There is no indication that the issue leads to accessing memoryoutside that allocated to the module.

Where it's fixed

ProductFixed inFixReleased
Linux
libyaml-syck-perl · Debian 12.15 (bookworm) 1.34-2+deb12u1 DEBIAN-CVE-2025-11683 Oct 16, 2025
libyaml-syck-perl · Debian 13.5 (trixie) 1.34-2+deb13u1 DEBIAN-CVE-2025-11683 Oct 16, 2025
libyaml-syck-perl · Debian 14 1.34-4 DEBIAN-CVE-2025-11683 Oct 16, 2025
libyaml-syck-perl · Ubuntu 18.04.6 LTS (bionic) 1.29-1ubuntu0.18.04.1~esm1 libyaml-syck-perl 1.29-1ubuntu0.18.04.1~esm1 Oct 15, 2025
libyaml-syck-perl · Ubuntu 20.04 LTS (focal) 1.31-1ubuntu0.1~esm1 libyaml-syck-perl 1.31-1ubuntu0.1~esm1 Oct 15, 2025
libyaml-syck-perl · Ubuntu 22.04.1 LTS (jammy) 1.34-1ubuntu0.1~esm1 libyaml-syck-perl 1.34-1ubuntu0.1~esm1 Oct 15, 2025
libyaml-syck-perl · Ubuntu 24.04.5 LTS (noble) 1.34-2ubuntu0.24.04.1~esm1 libyaml-syck-perl 1.34-2ubuntu0.24.04.1~esm1 Oct 15, 2025
libyaml-syck-perl · Ubuntu 25.04 (plucky) 1.34-2ubuntu0.25.04.1 libyaml-syck-perl 1.34-2ubuntu0.25.04.1 Jan 16, 2026
libyaml-syck-perl · Ubuntu 25.10 (questing) 1.34-3ubuntu0.1 libyaml-syck-perl 1.34-3ubuntu0.1 Oct 15, 2025
perl-YAML-Syck · amzn 2023 1.36-1.amzn2023.0.1 ALAS2023-2025-1248 Oct 27, 2025
perl-YAML-Syck · opensuse-leap 16.0 1.470.0-bp160.1.1 OPENSUSE-SU-2026:21497-1 Jul 29, 2026
perl-YAML-Syck-debuginfo · amzn 2023 1.36-1.amzn2023.0.1 ALAS2023-2025-1248 Oct 27, 2025
perl-YAML-Syck-debugsource · amzn 2023 1.36-1.amzn2023.0.1 ALAS2023-2025-1248 Oct 27, 2025

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