CVE-2026-62864 (GCVE-0-2026-62864)
Vulnerability from cvelistv5 – Published: 2026-10-30 20:34 – Updated: 2026-11-02 15:05
VLAI
EPSS
VEX
Title
Ring's nested-params middleware has inefficient regular expression complexity
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 15:04 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/ring-clojure/ring/security/adv… | x_refsource_CONFIRM |
| https://github.com/ring-clojure/ring/commit/18738… | x_refsource_MISC |
| https://github.com/ring-clojure/ring/tree/1.15.5 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ring-clojure | ring |
Affected:
< 1.15.5
|
guessed |
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