CVE-2026-9516— Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws
Possible ATT&CK Techniques 2AI
T1059 · Command and Scripting Interpreter T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RURBAN | Cpanel::JSON::XS | < 4.41 | affected |
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I. Basic Information for CVE-2026-9516
Vulnerability Information
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Vulnerability Title
Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws
Source: NVD (National Vulnerability Database)
Vulnerability Description
Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws. To skip a leading 3-byte UTF-8 BOM, decode_json() advances the input scalar's string pointer past the mark with SvPV_set() and restores it only on the normal return path. When decoding aborts through a Perl exception, for example a filter_json_object callback that croaks, the restore is skipped and the scalar is left with its string pointer offset into its own buffer and a shortened length. When that scalar is later freed, the allocator receives an invalid pointer and the interpreter aborts. A single BOM prefixed document decoded with a throwing filter callback crashes any caller.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对无效指针或索引的释放
Source: NVD (National Vulnerability Database)
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，该漏洞源于在解码过滤器回调抛出异常时，通过UTF-8 BOM前缀输入导致拒绝服务，可能使攻击者利用单个BOM前缀文档导致崩溃。
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-2026-9516
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-9516 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-9516
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