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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

Quick assessment

Affected
RURBAN Cpanel::JSON::XS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cpanel::JSON::XS是RURBAN个人开发者的一款将Perl数据结构转换为JSON的工具。 Cpanel::JSON::XS 4.41之前版本存在安全漏洞，该漏洞源于在启用dupkeys_as_arrayref时，通过重复对象键导致类型混淆，可能使攻击者利用攻击者控制的标量内容导致崩溃。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
RURBAN Cpanel::JSON::XS < 4.41 affected
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I. Basic Information for CVE-2026-9334

Vulnerability Information
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Vulnerability Title
Cpanel::JSON::XS versions before 4.41 for Perl allow type confusion via duplicate object keys when dupkeys_as_arrayref is enabled
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
Cpanel::JSON::XS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cpanel::JSON::XS是RURBAN个人开发者的一款将Perl数据结构转换为JSON的工具。 Cpanel::JSON::XS 4.41之前版本存在安全漏洞，该漏洞源于在启用dupkeys_as_arrayref时，通过重复对象键导致类型混淆，可能使攻击者利用攻击者控制的标量内容导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
RURBAN Cpanel::JSON::XS 0 ~ 4.41 -

II. Public POCs for CVE-2026-9334

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III. Intelligence Information for CVE-2026-9334

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Patches & Fixes for CVE-2026-9334 (1)

IV. Related Vulnerabilities

Same product: Cpanel::JSON::XS
Same vendor: RURBAN
Same weakness: CWE-843

V. Comments for CVE-2026-9334

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