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Vulnerability record · CVE-2025-11683 · published 16 October 2025

CVE-2025-11683: Toddr yaml\ memory buffer overflow vulnerability

Toddr · Yaml\

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.

6.5 CVSS 3.1 Medium EPSS 0.25% · top 85.7% CWE-119 · Memory buffer overflow
6.5CVSS 3.1 base score
0.25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cpan-authors/YAML-Syck/pull/65 Issue Tracking
https://metacpan.org/dist/YAML-Syck/changes ProductRelease Notes

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-11683), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.