GHSA-qfqj-xxqv-cxfwHighCVSS 7.3
Cpanel::JSON::XS versions before 4.41 for Perl allow type confusion via duplicate object keys...
🔗 CVE IDs covered (1)
📋 Description
Cpanel::JSON::XS versions before 4.41 for Perl allow type confusion via duplicate object keys when dupkeys_as_arrayref is enabled.
decode_hv() collapses duplicate object keys into an array reference under dupkeys_as_arrayref. The branch reached for a duplicate key tests SvTYPE (old_value) != SVt_RV && SvTYPE (SvRV (old_value)) != SVt_PVAV, which evaluates SvRV(old_value) before establishing that old_value is a reference. When the existing value is a plain scalar rather than an array reference, a non-reference scalar is dereferenced as a reference.
A caller decoding untrusted JSON with dupkeys_as_arrayref enabled is crashed, and the incompatible access follows a pointer taken from attacker controlled scalar contents.
🔗 References (5)
- https://nvd.nist.gov/vuln/detail/CVE-2026-9334
- https://github.com/rurban/Cpanel-JSON-XS/commit/11a7c550a0d8fac2f84414f24d5df9b2bfe346e2.patch
- https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes
- http://www.openwall.com/lists/oss-security/2026/06/03/4
- https://github.com/advisories/GHSA-qfqj-xxqv-cxfw