# CVE-2026-9334: libcpanel-json-xs-perl: Cpanel::JSON::XS versions before 4.41 for Perl allow type confusion via duplicate object keys when dupkeys_as_arrayre...

CVE-2026-9334 is fixed in 2 products on 1 platform, first by OPENSUSE-SU-2026:21140-1, released June 19, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-9334
- Priority: High
- CVSS: 7.3 (high)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 3, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libcpanel-json-xs-perl Debian 14 | 4.41-1 | [DEBIAN-CVE-2026-9334](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9334.md) | Jun 24, 2026 |
| Linux | perl-Cpanel-JSON-XS opensuse-leap 16.0 | 4.420.0-bp160.1.1 | [OPENSUSE-SU-2026:21140-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21140-1.md) | Jun 19, 2026 |
| Linux | perl-Cpanel-JSON-XS sles 15.7 | 4.800.0-150700.3.9.1 | [SUSE-SU-2026:4926-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4926-1.md) | Nov 7, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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