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CVE-2026-110682— Cpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse

Quick assessment

Affected
CVE-2026-110682
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 环境下的 Cpanel::JSON::XS 模块从 4.42 版本到 4.80 之前的版本存在漏洞：在 函数中，输入数据的分块（chunking）方式会改变顶层数字的解码结果。 由于 默认启用，且 会继承该设置，而顶层的数字、 、 或 没有结束分隔符，因此增量解析器会直接解码当前已接收到的数据。例如，字节序列 若一次性读取会被解析为一个数值 ，但若分两次读取（第一次读 ，第二次读 ），则会被解析为两个独立的数值 和 。 能够影响读取边界的攻击者可借此操纵流式消费者所解码的消息数量及其携带的值。

AI Predicted 7.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None 4.42< 4.80 affected

I. Basic Information for CVE-2026-110682

Vulnerability Information
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Vulnerability Title
Cpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse
Source: CVE Program / CVE List V5
Vulnerability Description
Cpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse. allow_nonref is enabled by default and incr_parse inherits it. A top-level number, true, false or null has no closing delimiter, so the incremental parser decodes whatever has arrived. The bytes 12 decode as one value when read together, but as 1 and then 2 when split across two reads. A peer that can influence read boundaries can change how many messages a stream consumer decodes and what values they carry.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 4.42 ~ 4.80 -

II. Public POCs for CVE-2026-110682

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-110682

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Other References for CVE-2026-110682 (1)

IV. Related Vulnerabilities

Same weakness: CWE-436

V. Comments for CVE-2026-110682

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