CVE-2026-57077 | YAML::Syck versions before 1.47 for Perl allow an out-of-bou…

Description

YAML::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.

Metadata

CVE ID: CVE-2026-57077
State: PUBLISHED
Assigner: CPANSec
Reserved: 2026-06-23 18:02 UTC
Published: 2026-07-16 21:41 UTC
Last updated: 2026-07-16 21:41 UTC
Primary CWE: CWE-125
CWE-125 Out-of-bounds Read
Vendor / Product: TODDR / YAML::Syck
Sources: cve.org · NVD

Severity & Metrics

No CVSS data available.

Affected products (1)

Vendor	Product	Platform	Versions
TODDR	YAML::Syck	—	0 < 1.47

Weakness (CWE)

CWE	Source	Description
CWE-125	cna	CWE-125 Out-of-bounds Read

References (3)