PT-2026-60593 · Toddr · Yaml::Syck
CVE-2026-57075
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Published
2026-07-16
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Updated
2026-07-16
None
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YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck base64dec.
The base64 decoder in the bundled libsyck indexes the 256-entry static table b64 xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path.
Any caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result.
Out of bounds Read
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Weakness Enumeration
Related Identifiers
Affected Products
Yaml::Syck