PT-2026-45891 · Cpan · Cpanel::Json::Xs

Paul Johnson · Published 2026-06-03 · Updated 2026-06-05 · CVE-2026-9334

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions Cpanel::JSON::XS versions prior to 4.41

Description Type confusion occurs when dupkeys as arrayref is enabled, allowing duplicate object keys to cause a crash. The decode hv() function collapses duplicate keys into an array reference; however, it performs a dereference operation on old value before confirming it is actually a reference. If the existing value is a plain scalar, the system attempts to dereference a non-reference scalar using a pointer derived from attacker-controlled content.

Recommendations Update to version 4.41 or later. As a temporary workaround, disable the dupkeys as arrayref option when decoding untrusted JSON.

Fix

Type Confusion

Weakness Enumeration

CWE-843

Related Identifiers

CVE-2026-9334

OPENSUSE-SU-2026:10950-1

Affected Products

Cpanel::Json::Xs

References · 11

• https://github.com/rurban/Cpanel-JSON-XS/commit/11a7c550a0d8fac2f84414f24d5df9b2bfe346e2.patch · Patch
• http://openwall.com/lists/oss-security/2026/06/03/4 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-9334 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10950-1 · Vendor Advisory
• https://t.me/CVEtracker/55680 · Telegram Post
• https://suse.com/security/cve/CVE-2026-9516 · Note
• https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes · Note
• https://suse.com/security/cve/CVE-2026-9334 · Note
• https://twitter.com/CVEnew/status/2061993185648263277 · Twitter Post
• https://t.me/cveNotify/165782 · Telegram Post
• https://twitter.com/threatcluster/status/2062881363804533218 · Twitter Post