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CVE-2026-120632— CGI versions before 5.00 for Perl allow CPU exhaustion via a backtracking regex on the XForms multipart/related Content-Type

Quick assessment

Affected
CVE-2026-120632
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 CGI 模块在 5.00 之前的版本中，存在通过 XForms 的 内容类型利用回溯正则表达式导致 CPU 资源耗尽的漏洞。 当 POST 请求的 包含 时，系统会使用一个未锚定的正则表达式来提取 和 参数。该模式在边界捕获组的两侧均使用了 ，导致在匹配失败的头部内容上，正则引擎会进行立方级时间复杂度的回溯。此攻击无需请求体即可触发。

AI Predicted 7.5 Difficulty: Easy EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 5.00 affected

I. Basic Information for CVE-2026-120632

Vulnerability Information
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Vulnerability Title
CGI versions before 5.00 for Perl allow CPU exhaustion via a backtracking regex on the XForms multipart/related Content-Type
Source: CVE Program / CVE List V5
Vulnerability Description
CGI versions before 5.00 for Perl allow CPU exhaustion via a backtracking regex on the XForms multipart/related Content-Type. When a POST Content-Type contains multipart/related, the boundary and start parameters are extracted with an unanchored pattern that puts .+ on either side of the boundary capture, which backtracks in cubic time on a header that does not match. No request body is needed.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 5.00 -

II. Public POCs for CVE-2026-120632

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-120632

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Other References for CVE-2026-120632 (3)

IV. Related Vulnerabilities

Same weakness: CWE-1333