CVE-2026-57077: Toddr Yaml::syck

High severity, CVSS 7.7. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Toddr Yaml::syck: before 1.47 (fixed in 1.47)

Published 2026-07-16. Last modified 2026-07-17.