How severe is CVE-2026-9334?

CVE-2026-9334 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-9334 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-9334?

CVE-2026-9334 affects Rurban Cpanel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9334?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-9334 have an EU (EUVD) identifier?

Yes. CVE-2026-9334 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34060.

When was CVE-2026-9334 published?

CVE-2026-9334 was published on 2026-06-03 and last updated on 2026-06-17.

CVE-2026-9334

CVE-2026-9334 is a high-severity vulnerability in Rurban Cpanel with a CVSS 3.x base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-843.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34060
Weakness: CWE-843
Affected product: Rurban Cpanel
Published: 2026-06-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-9334?: 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.
How severe is CVE-2026-9334?: CVE-2026-9334 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-9334 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-9334?: CVE-2026-9334 affects Rurban Cpanel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9334?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-9334 have an EU (EUVD) identifier?: Yes. CVE-2026-9334 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34060.
When was CVE-2026-9334 published?: CVE-2026-9334 was published on 2026-06-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rurban:cpanel\:\:json\:\:xs:*:*:*:*:*:perl:*:*

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