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CVE-2026-62864— Ring's nested-params middleware has inefficient regular expression complexity

Quick assessment

Affected
ring-clojure ring
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.

Ring 是一个受 Python 的 WSGI 和 Ruby 的 Rack 启发的 Clojure Web 应用程序库。在 1.15.5 版本之前， 命名空间中的 函数使用回溯正则表达式来匹配来自 URL 查询字符串和 HTTP 请求体的参数名称。攻击者可以构造特定的参数名称，触发二次时间复杂度 O(n²) 的正则匹配开销，从而导致依赖该中间件的应用程序遭受正则表达式拒绝服务（ReDoS）攻击。由于 中间件在 中默认启用，因此使用 的用户同样面临此风险。未启用该中间件的应用程序则不会暴露此解析路径。该问题已在 1.

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-62864

Vulnerability Information
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Vulnerability Title
Ring's nested-params middleware has inefficient regular expression complexity
Source: CVE Program / CVE List V5
Vulnerability Description
Ring is a Clojure web applications library inspired by Python's WSGI and Ruby's Rack. Prior to 1.15.5, `wrap-nested-params` in the `ring.middleware.nested-params` namespace uses a backtracking regular expression to match parameter names from URL query strings and HTTP request bodies. An attacker can craft a parameter name that drives quadratic O(n^2) matching work, causing regular-expression denial of service in applications using the middleware. `Ring-Defaults` users are also exposed because nested-params is enabled by default. Applications omitting the middleware do not expose this parsing path. This issue is fixed in version 1.15.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ring-clojure ring < 1.15.5 -

II. Public POCs for CVE-2026-62864

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-62864

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Patches & Fixes for CVE-2026-62864 (1)

Vendor Advisories for CVE-2026-62864 (1)

Vendor Pages for CVE-2026-62864 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1333