CVE-2026-107826 Coraza JSON body processor: argument-limit truncation reopens an unbounded-depth gjson.Valid stack overflow (process crash)
An unauthenticated attacker can crash the hosting process by submitting deeply nested JSON that bypasses depth limits in the Coraza WAF library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107826?
CVE-2026-107826 is a high-severity denial of service vulnerability in corazawaf coraza, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-674
Which versions are affected by CVE-2026-107826?
5 open source packages ship an affected version, including github.com/corazawaf/coraza/v3, github.com/corazawaf/coraza and github.com/corazawaf/coraza/v2.
| Package | Affected | Fixed in |
|---|---|---|
github.com/corazawaf/coraza/v3 Go | From 3.0.0 | 3.8.1 |
github.com/corazawaf/coraza/v3 Go | From 3.0.0 | 3.8.1 |
github.com/corazawaf/coraza/v3 Go | From 3.0.0 | 3.8.1 |
github.com/corazawaf/coraza Go | All versions | None |
github.com/corazawaf/coraza/v2 Go | All versions | None |
How do I fix CVE-2026-107826?
Upgrade github.com/corazawaf/coraza/v3 to 3.8.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-107826 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107826 exists.
Sources
Also known as GHSA-6gcq-wc29-5xf2, GO-2026-6693.