YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len

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Summary

CVECVE-2026-57077
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 22:17:43 UTC
Updated2026-07-16 22:17:43 UTC
DescriptionYAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len. In the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a "\r\n" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover. Any caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read.

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.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org
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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