CVE Explorer
CVE-2026-5089
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 p
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"YAML-Syck","product":"YAML::Syck","programFiles":["perl_syck.h"],"repo":"https://github.com/toddr/YAML-Syck","vendor":"TODDR","versions":[{"lessThan":"1.38","status":"affected","version":"0","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/adp/1/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-124","description":"CWE-124 Buffer Underwrite ('Buffer Underflow')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/cna/problemTypes/0/descriptions/0
Source references
6 source assertions{"url":"http://www.openwall.com/lists/oss-security/2026/05/12/16"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/adp/0/references/0
{"tags":["patch"],"url":"https://github.com/cpan-authors/YAML-Syck/commit/208a4d3bd1b5cdb4a791a6e3905bd6bd45e9d005.patch"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/cpan-authors/YAML-Syck/issues/132"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/adp/1/references/0
{"tags":["issue-tracking"],"url":"https://github.com/cpan-authors/YAML-Syck/issues/132"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/cna/references/1
{"tags":["issue-tracking"],"url":"https://github.com/cpan-authors/YAML-Syck/pull/133"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/cna/references/2
{"tags":["release-notes"],"url":"https://metacpan.org/release/TODDR/YAML-Syck-1.38/changes"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:eadf40c2719067dd0dd9588d57c1afaebdc263cf2a1c38c158b639b3888ed2f0 · sha256:10ffc77fe1bf248e… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.