---
id: "CVE-2026-114099"
kind: "vulnerability"
aliases: ["CVE-2026-114099"]
title: "Coraza WAF: JSON body flattening lets crafted keys hide SQL injection"
severity: "medium"
cvss: 6.9
epss: 0.00198
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["coraza", "go", "owasp-crs", "package", "self-hosted", "waf"]
not_affected_if: ["default-config", "non-json-bodies", "other-waf"]
published_at: "2026-10-21T01:17:35+00:00"
first_seen_at: "2026-10-23T21:57:28+00:00"
updated_at: "2026-10-25T03:40:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114099", "first_seen_at": "2026-10-23T21:57:28+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-114099", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Coraza WAF: JSON body flattening lets crafted keys hide SQL injection

Coraza, a Go web application firewall, flattens nested JSON request bodies into dot-separated argument names without escaping literal dots, so different properties collide. An unauthenticated attacker can send a later dotted key such as account.role that overwrites a malicious nested value, so OWASP CRS rules miss SQL injection payloads that the backend still receives.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Coraza version in `go.mod` or the vendored module: affected if it is from `3.0.0` up to but not including `3.8.1`.
- Check whether the Coraza JSON body processor is enabled with CRS rules protecting endpoints that accept JSON request bodies.

## Fix

- Upgrade Coraza to `3.8.1` or later.
- Until upgraded, unknown whether a configuration workaround exists; the sources do not say.

## Timeline

- 2026-10-23T21:57:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114099
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-114099

## From the sources

Coraza from 3.0.0 before 3.8.1 has a JSON body processor that flattens nested properties into dot-separated ARGS_POST names without escaping literal dots, so distinct properties collide. Unauthenticated attackers can add a later dotted property such as account.role that overwrites a malicious nested value, hiding SQL injection payloads from OWASP CRS rules while backends still receive them.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_