---
id: "CVE-2026-114100"
kind: "vulnerability"
aliases: ["CVE-2026-114100"]
title: "Coraza WAF: URL-encoded bodies with charset parameter skip inspection"
severity: "medium"
cvss: 6.9
epss: 0.00225
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["coraza", "go", "package", "self-hosted", "waf"]
not_affected_if: ["body-inspection-off", "no-coraza"]
published_at: "2026-10-21T01:17:35+00:00"
first_seen_at: "2026-10-23T21:57:28+00:00"
updated_at: "2026-10-25T03:40:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114100", "first_seen_at": "2026-10-23T21:57:28+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-114100", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Coraza WAF: URL-encoded bodies with charset parameter skip inspection

Coraza, a Go web application firewall library, only parses request bodies whose Content-Type matches exactly, so adding a charset parameter skips body rules. An unauthenticated attacker can send form data with a charset suffix so WAF body rules miss the payload while the backend still processes it.

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

## How to check

- Check the Coraza version in go.mod (`go list -m github.com/corazawaf/coraza/v3`) and whether it is between `3.0.4` and `3.8.1`
- Check whether the WAF runs in front of the app with body inspection enabled

## Fix

- Upgrade Coraza to `3.8.1` or later
- Until upgraded, unknown whether a configuration workaround exists

## Timeline

- 2026-10-23T21:57:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114100
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-114100

## From the sources

Coraza from 3.0.4 before 3.8.1 contains a request body inspection bypass because request-body processor selection compares the entire Content-Type value exactly, so URL-encoded bodies whose Content-Type carries a media-type parameter are never parsed. Unauthenticated attackers can send application/x-www-form-urlencoded; charset=UTF-8 to keep ARGS_POST and REQUEST_BODY empty, evading body rules while the backend still processes the payload.

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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_