Threat Intelligence Database

CVE-2026-107834 is a medium severity vulnerability in OWASP Coraza WAF versions 3.0.0 through 3.7.x. It involves uncontrolled resource consumption due to the handling of multipart file uploads, where temporary file descriptors remain open until the entire request completes. An unauthenticated attacker can exploit this by sending many minimal file parts in a multipart request, exhausting the process file descriptor table and causing failures in creating temporary files, blocking legitimate uploads, and preventing the process from opening files or sockets. This issue is fixed in version 3.8.0.

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.