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CVE-2026-110673— Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag

Quick assessment

Affected
CVE-2026-110673
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 的 Cpanel::JSON::XS 模块在 4.80 版本之前存在栈耗尽漏洞。当在 函数中启用 选项时，攻击者可通过构造嵌套的带标签值（tagged values）触发该漏洞。 启用 后，字符 "(" 表示一个带标签值的开始。其标签和值会被递归解析，且二者均可再次启动新的带标签值。与数组和对象不同，这种嵌套结构不受 参数的限制。 连续输入多个 "(" 字符会导致 C 语言调用栈耗尽，从而引发无法捕获的段错误（segmentation fault），且该行为不受 设置的影响。

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 4.80 affected

I. Basic Information for CVE-2026-110673

Vulnerability Information
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Vulnerability Title
Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag
Source: CVE Program / CVE List V5
Vulnerability Description
Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag. With allow_tags, "(" starts a tagged value. Its tag and value are decoded recursively, and each can start another tagged value. Unlike arrays and objects, this nesting is not counted against max_depth. A run of "(" bytes exhausts the C stack and triggers an uncatchable segmentation fault regardless of max_depth.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-110673

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III. Intelligence Information for CVE-2026-110673

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Patches & Fixes for CVE-2026-110673 (1)

Other References for CVE-2026-110673 (1)

IV. Related Vulnerabilities

Same weakness: CWE-674

V. Comments for CVE-2026-110673

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