corazawaf Coraza up to 3.7.x JSON Body Processor json.go ProcessResponse ignoreJSONRecursionLimit allocation of resources

Summaryinfo

A vulnerability, which was classified as problematic, has been found in corazawaf Coraza up to 3.7.x. The impacted element is the function ProcessResponse of the file internal/bodyprocessors/json.go of the component JSON Body Processor. Performing a manipulation of the argument ignoreJSONRecursionLimit results in allocation of resources. This vulnerability was named CVE-2026-107833. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in corazawaf Coraza up to 3.7.x. This affects the function ProcessResponse of the file internal/bodyprocessors/json.go of the component JSON Body Processor. The manipulation of the argument ignoreJSONRecursionLimit with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-107833 since 10/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 3.8.0 eliminates this vulnerability.

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Productinfo

Vendor

• corazawaf

Name

• Coraza

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7

Website

• Product: https://github.com/corazawaf/coraza/

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