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

Paul Johnson · CVE-2026-9334 · Published 2026-06-01 · Updated 2026-07-06

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.

Exploit

Fix

Type Confusion

Weakness Enumeration

CWE-843

Related Identifiers

CVE-2026-9334

OPENSUSE-SU-2026:10950-1

OPENSUSE-SU-2026:21140-1

SUSE-SU-2026:2782-1

Affected Products

Cpanel::Json::Xs

References · 29

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9334.json · Exploit
• https://github.com/rurban/Cpanel-JSON-XS/commit/11a7c550a0d8fac2f84414f24d5df9b2bfe346e2.patch · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2026:21140-1 · Vendor Advisory
• http://openwall.com/lists/oss-security/2026/06/03/4 · Patch
• https://cve.org/CVERecord?id=CVE-2026-9334 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-9334 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-9334 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-9334 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10950-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-9334 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2782-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-9334 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-9334 · Vendor Advisory
• https://github.com/rurban/Cpanel-JSON-XS · Note
• https://twitter.com/oss_security/status/2063614552537739548 · Twitter Post