YAML::Syck versions before 1.38 for Perl has an out-of-bounds read. The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in 1:30:45), the inner while loop can decrement a pointer past the start of the string buffer: while ( colon >= ptr && *colon != ':' ) { colon--; } if ( *colon == ':' ) *colon = '\0'; // colon may be ptr-1 here When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon dereference reads one byte before the allocated buffer.
History

Thu, 14 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 12 May 2026 19:30:00 +0000

Type Values Removed Values Added
References

Tue, 12 May 2026 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Toddr
Toddr yaml::syck
Vendors & Products Toddr
Toddr yaml::syck

Tue, 12 May 2026 16:45:00 +0000

Type Values Removed Values Added
Description YAML::Syck versions before 1.38 for Perl has an out-of-bounds read. The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in 1:30:45), the inner while loop can decrement a pointer past the start of the string buffer: while ( colon >= ptr && *colon != ':' ) { colon--; } if ( *colon == ':' ) *colon = '\0'; // colon may be ptr-1 here When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon dereference reads one byte before the allocated buffer.
Title YAML::Syck versions before 1.38 for Perl has an out-of-bounds read
Weaknesses CWE-124
References

cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published: 2026-05-12T16:14:21.951Z

Updated: 2026-05-14T13:51:01.952Z

Reserved: 2026-03-28T19:33:37.653Z

Link: CVE-2026-5089

cve-icon Vulnrichment

Updated: 2026-05-12T18:35:46.042Z

cve-icon NVD

Status : Deferred

Published: 2026-05-12T17:16:21.720

Modified: 2026-05-14T15:16:49.377

Link: CVE-2026-5089

cve-icon Redhat

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