Vulnerability in Corazawaf Coraza
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Corazawaf Coraza — versions >= 3.0.0, < 3.8.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107833?
- CVE-2026-107833 is a medium-severity vulnerability in Corazawaf Coraza, classified under Uncontrolled Recursion. CVSS score: 5.9/10. Published 2026-10-09.
- How severe is CVE-2026-107833?
- Medium severity. CVSS v3 base score is 5.9 out of 10.