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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/ring-clojure/ring/commit/18738cbb8ab7504da4a5c72c9eb5fdcbf142
- https://github.com/ring-clojure/ring/security/advisories/GHSA-q2j3-fc6x-78jj
- https://github.com/ring-clojure/ring/tree/1.15.5
FAQ
What is CVE-2026-62864?
CVE-2026-62864 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-62864?
CVE-2026-62864 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-62864?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.