ring-clojure Ring up to 1.15.4 Nested Params Middleware ring.middleware.nested-params.wrap-nested-params incorrect regex

Summaryinfo

A vulnerability was found in ring-clojure Ring up to 1.15.4. It has been rated as problematic. Impacted is the function ring.middleware.nested-params.wrap-nested-params of the component Nested Params Middleware. The manipulation leads to incorrect regex. This vulnerability is documented as CVE-2026-62864. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in ring-clojure Ring up to 1.15.4. This issue affects the function ring.middleware.nested-params.wrap-nested-params of the component Nested Params Middleware. The manipulation with an unknown input leads to a incorrect regex vulnerability. Using CWE to declare the problem leads to CWE-185. The product specifies a regular expression in a way that causes data to be improperly matched or compared. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-62864 since 07/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 1.15.5 eliminates this vulnerability.

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Productinfo

Vendor

• ring-clojure

Name

• Ring

Version

• 1.15.0
• 1.15.1
• 1.15.2
• 1.15.3
• 1.15.4

Website

• Product: https://github.com/ring-clojure/ring/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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