Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d
- https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes
- https://www.cve.org/CVERecord?id=CVE-2025-11683
FAQ
What is CVE-2026-57077?
CVE-2026-57077 is a vulnerability with a CVSS score of 7.7 (HIGH). 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 ...
How severe is CVE-2026-57077?
CVE-2026-57077 has been rated HIGH with a CVSS base score of 7.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-57077?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.