CVE-2026-9334

HIGH EPSS 17.6%
Published Jun 3, 20264w ago · Modified Jun 17, 20261w ago
7.3 CVSS 3.1
High
Find Similar
Published Jun 3, 2026 4w ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.3
Exploitability
3.9
Impact
3.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability Low

Threat Intelligence

EPSS Exploit Probability
17.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-843

Affected Products 1

VendorProductVersionRange
rurbancpanel\\ <4.41

References 3

  • openwall.com http://www.openwall.com/lists/oss-security/2026/06/03/4
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/rurban/Cpanel-JSON-XS/commit/11a7c550a0d8fac2f84414f24d5df9b2bfe346e2.patch
    Patch
  • metacpan.org https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes
    Release Notes

Remediation

  • openwall.com http://www.openwall.com/lists/oss-security/2026/06/03/4
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/rurban/Cpanel-JSON-XS/commit/11a7c550a0d8fac2f84414f24d5df9b2bfe346e2.patch
    Patch