YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec

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Summary

CVECVE-2026-57075
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 22:17:43 UTC
Updated2026-07-17 04:16:50 UTC
DescriptionYAML::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 that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result.

Risk And Classification

Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TODDR YAMLSyck affected 1.47 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/TODDR/YAML-Syck-1.47/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2026/07/17/2 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to YAML-Syck 1.47 or later.

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