CVE-2026-9334 — Cpanel::JSON::XS versions before 4.41 for Perl allow type confusion via duplicate object keys when dupkeys_as_arrayref…

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
RURBAN / Cpanel::JSON::XS	affected 0 before 4.41

CWE

CWE-843

References

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/06/03/4

CISA-ADP

No English description supplied.

No references supplied.