CVE Explorer
CVE-2026-57075
YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec.
The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path.
Any caller tha
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":["emitter.c"],"programRoutines":[{"name":"syck_base64dec"}],"repo":"https://github.com/toddr/YAML-Syck","vendor":"TODDR","versions":[{"lessThan":"1.47","status":"affected","version":"0","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3b9f8e22d26f213a387b9b0ef3d7c5f466725f6ae6b69f99abbe135b31cb7662 · sha256:1f536729cc5c8bd1… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3b9f8e22d26f213a387b9b0ef3d7c5f466725f6ae6b69f99abbe135b31cb7662 · sha256:1f536729cc5c8bd1… · /containers/adp/1/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3b9f8e22d26f213a387b9b0ef3d7c5f466725f6ae6b69f99abbe135b31cb7662 · sha256:1f536729cc5c8bd1… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"url":"http://www.openwall.com/lists/oss-security/2026/07/17/2"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3b9f8e22d26f213a387b9b0ef3d7c5f466725f6ae6b69f99abbe135b31cb7662 · sha256:1f536729cc5c8bd1… · /containers/adp/0/references/0
{"tags":["patch"],"url":"https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3b9f8e22d26f213a387b9b0ef3d7c5f466725f6ae6b69f99abbe135b31cb7662 · sha256:1f536729cc5c8bd1… · /containers/cna/references/1
{"tags":["release-notes"],"url":"https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3b9f8e22d26f213a387b9b0ef3d7c5f466725f6ae6b69f99abbe135b31cb7662 · sha256:1f536729cc5c8bd1… · /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.