CVE-2026-57077
N/A
N/A
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| TODDR | YAML::Syck | 0 < 1.47 | affected |
Weaknesses
- CWE-125: CWE-125 Out-of-bounds Read
References
- https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes
- https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch
- https://www.cve.org/CVERecord?id=CVE-2025-11683
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