7.7
High
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
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| YAML::Syck 1.47 | earliest → < 1.47 | 1.47 |
References
- metacpan.org metacpan.org
- github.com github.com
- www.cve.org www.cve.org
Timeline
- Published
- Last modified
Other CVEs of YAML::Syck
The 7 CVEs of YAML::Syck →
CVE-2026-57076
YAML::Syck versions before 1.47 for Perl allow a heap use-after-free via an anchor name reused as an anchors-table key…
7.8
High
CVE-2026-57075
YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in…
9.1
Critical
CVE-2026-13713
YAML::Syck versions before 1.47 for Perl allow a use-after-free and double-free via an anchor node freed while still…
6.2
Medium
CVE-2026-5089
YAML::Syck versions before 1.38 for Perl has an out-of-bounds read
7.3
High