CVE-2026-62864
HIGH
MEDIUM
Priority: 0.03
BB Relevance:
75/100
Published: 2026-10-30
Modified: 2026-10-30
First seen: 2026-10-30
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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.
Weakness Classification (1)
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| ring-clojure | ring | < 1.15.5 |
References & Advisories (3)
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM