CVE-2026-9516

HighCVSS 7.5

Published: 03/06/2026(UTC)Updated: 22/07/2026(UTC)Translated: 24/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.36%

29th percentile - higher than 29% of all known CVEs

Summary

Denial of service vulnerability in Cpanel::JSON::XS for Perl before version 4.41. Specially crafted input with a UTF-8 BOM prefix can cause the Perl interpreter to crash when a decode filter callback throws an exception.

Risk Assessment

An attacker can crash applications using this library, leading to service disruption.

Recommendation

Update the Cpanel::JSON::XS library to version 4.41 or later.

Other vulnerabilities in Cpanel::JSON::XS

CVE-2026-9334High
Type confusion in Cpanel::JSON::XS before 4.41 for Perl with dupkeys_as_arrayref enabled. decode_hv() dereferences a non-reference scalar as a reference, causing crashes.

Original NVD description (English source)

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.