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CVE-2026-110672— Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded key of an object rejected for a duplicate key or a missing colon in decode_hv

Quick assessment

Affected
CVE-2026-110672
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.

Perl 语言中，Cpanel::JSON::XS 4.80 之前的版本在 函数处理因重复键或缺少冒号而被拒绝的对象时，会泄露已解码的键。 具体而言，若某个键满足以下任一条件：长度达到或超过 24 个字节、包含非 ASCII 字节，或包含转义序列，则会被解码并分配到一个新的标量（scalar）中。然而，当该对象因键后缺少冒号而被拒绝，或从 4.09 版本起因重复键而被拒绝时，该标量并未被释放。除非显式设置了 、 或 选项，否则重复键将被视为错误。 若进程在解码失败后继续运行，则每个被拒绝的文档都会保留一个由攻击者（

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 4.80 affected

I. Basic Information for CVE-2026-110672

Vulnerability Information
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Vulnerability Title
Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded key of an object rejected for a duplicate key or a missing colon in decode_hv
Source: CVE Program / CVE List V5
Vulnerability Description
Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded key of an object rejected for a duplicate key or a missing colon in decode_hv. A quoted key of 24 or more bytes, or one containing a non-ASCII byte or an escape sequence, is decoded into a new scalar. Nothing frees that scalar when the object is rejected for a missing ':' after the key or, from 4.09, for a duplicate key. Duplicate keys are an error unless allow_dupkeys, dupkeys_as_arrayref or relaxed is set. A process that keeps running after a failed decode retains one key per rejected document, with its size chosen by the sender. Repeated requests exhaust process memory.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 4.80 -

II. Public POCs for CVE-2026-110672

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III. Intelligence Information for CVE-2026-110672

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Patches & Fixes for CVE-2026-110672 (1)

Other References for CVE-2026-110672 (1)

IV. Related Vulnerabilities

Same weakness: CWE-401

V. Comments for CVE-2026-110672

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