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CVE-2026-57075 is an out-of-bounds read vulnerability in YAML::Syck for Perl before version 1.47, in the bundled libsyck base64 decoder function syck_base64dec(). The flaw is caused by indexing the 256-entry static decode table with a signed char value. When a !!binary YAML scalar contains a byte with the high bit set (0x80 or greater), that byte can be sign-extended on platforms where char is signed, producing a negative array index and causing a read before the start of the lookup table. The vulnerable path is reachable through the default YAML::Syck Load and LoadFile parsing path when processing untrusted YAML containing a !!binary node, and it is not gated by optional code-loading or blessing-related settings. The issue is described as generally non-crashing, but the out-of-bounds value can propagate into the decoded binary result.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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