Medium 5.9Published Oct 9, 2026

CVE-2026-107833OWASP Coraza WAF: Unbounded recursion in JSON response body processor causes CPU exhaustion

Updated under an hour ago (2026-10-19 06:30 UTC)

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It affects corazawaf coraza. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-674
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

corazawaf coraza corazawaf:coraza (from the name)	from 3.0.0, < 3.8.0	CNA record

References

https://github.com/corazawaf/coraza/security/advisories/GHSA-3c6w-j9xm-8h2hx-refsource-confirm
https://github.com/corazawaf/coraza/commit/cae3c7407e7b84372c207033de03f15f89bf351ax-refsource-misc
https://github.com/corazawaf/coraza/releases/tag/v3.8.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.