CVE WatchJul 17, 2026

CVE-2026-57077

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 n

CVSS

7.7

High

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Jul 16, 2026 · Last modified: Jul 17, 2026 · CWE-125

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-08-052026-09-02

Technical 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.

Official references

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