PT-2026-45892 · Rurban · Cpanel::Json::Xs
Published
2026-06-03
·
Updated
2026-06-03
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CVE-2026-9516
None
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Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws.
To skip a leading 3-byte UTF-8 BOM, decode json() advances the input scalar's string pointer past the mark with SvPV set() and restores it only on the normal return path. When decoding aborts through a Perl exception, for example a filter json object callback that croaks, the restore is skipped and the scalar is left with its string pointer offset into its own buffer and a shortened length.
When that scalar is later freed, the allocator receives an invalid pointer and the interpreter aborts. A single BOM prefixed document decoded with a throwing filter callback crashes any caller.
Improper Handling of Exceptional Conditions
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Related Identifiers
Affected Products
Cpanel::Json::Xs