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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

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
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