CVE-2026-107826
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk39th percentile - higher than 39% of all known CVEs
Summary
OWASP Coraza WAF from 3.0.0 until 3.8.1, readJSON in json.go can stop its bounded flattening walk after reaching SecArgumentsLimit or the byte budget and then call gjson.Valid on the complete raw body. An unauthenticated attacker can submit shallow values followed by an extremely deeply nested JSON tail, causing gjson.Valid to recurse without a depth bound and terminate the hosting process with a fatal stack overflow.
Risk Assessment
The attack can cause an unrecoverable crash of the WAF process, potentially disrupting web application protection.
Recommendation
Update Coraza WAF to version 3.8.1 or later.
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Original NVD description (English source)
OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.0.0 until 3.8.1, readJSON in internal/bodyprocessors/json.go can stop its bounded flattening walk after reaching SecArgumentsLimit or the byte budget and then call gjson.Valid on the complete raw body. An unauthenticated attacker can submit shallow values followed by an extremely deeply nested JSON tail that was not visited by the bounded walk, causing gjson.Valid to recurse without a depth bound and terminate the hosting process with an unrecoverable fatal stack overflow. The ProcessRequest and ProcessResponse JSON paths share the affected readJSON validation flow, and the payload can remain within recommended body-size and argument-count limits. This issue is fixed in version 3.8.1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

