CVE-2026-5089YAML::Syck versions before 1.38 for Perl has an out-of-bounds read
Updated under an hour ago ()
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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.
- CVSS
- 7.3 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-124
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- CPANSec
- NVD analysis
- Deferred
- Record last updated
- May 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
TODDR YAML::Syck toddr:yaml_syck (from the name) | before 1.38 | CNA record |
References
- https://metacpan.org/release/TODDR/YAML-Syck-1.38/changesrelease-notes
- https://github.com/cpan-authors/YAML-Syck/issues/132issue-tracking
- https://github.com/cpan-authors/YAML-Syck/pull/133issue-tracking
- https://github.com/cpan-authors/YAML-Syck/commit/208a4d3bd1b5cdb4a791a6e3905bd6bd45e9d005.patchpatch
- http://www.openwall.com/lists/oss-security/2026/05/12/16
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.