CVE-2026-57075
N/A
Summary
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.
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
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