Threats Tagged 'cve-2026-107833'

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.0.0 until 3.8.0, ProcessResponse in internal/bodyprocessors/json.go passes the ignoreJSONRecursionLimit value of -1 to readJSON, while the recursive guard only stops at zero. A network attacker who can cause an application protected by Coraza to return deeply nested JSON can make response-body processing perform quadratic work, consuming one CPU core for seconds per response within the default ResponseBodyLimit. Request JSON processing is not affected by this specific path because it uses the configured request recursion limit, and exploitation requires response-body inspection to be enabled. This issue is fixed in version 3.8.0.

Coraza v3 contains a vulnerability in its JSON response body processor where there is no recursion limit enforced when parsing JSON responses. This leads to unbounded recursion and CPU exhaustion when processing deeply nested JSON responses. The request path enforces a recursion limit, but the response path does not, causing quadratic CPU usage growth with nesting depth. This can result in significant CPU consumption and denial of service when ResponseBodyAccess is enabled and JSON responses contain deeply nested structures.