---
id: "CVE-2026-124723"
page: "https://infrastack.ai/live/CVE-2026-124723"
kind: "vulnerability"
aliases: ["CVE-2026-124723"]
title: "Apache APISIX: encoded slash lets clients skip mTLS certificate checks"
severity: "medium"
cvss: 6.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apache-apisix", "api-gateway", "infrastructure", "mtls", "self-hosted"]
not_affected_if: ["default-config", "match-uri-encoded-slash-disabled", "no-mtls-routes"]
published_at: "2026-11-13T18:17:31+00:00"
first_seen_at: "2026-11-13T18:49:29+00:00"
updated_at: "2026-11-13T18:51:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124723", "first_seen_at": "2026-11-13T18:49:29+00:00"}]
exploit_sources: []
---

# Apache APISIX: encoded slash lets clients skip mTLS certificate checks

Link for people: https://infrastack.ai/live/CVE-2026-124723 (this .md is for agents)

With match_uri_encoded_slash enabled and skip_mtls_uri_regex set, a client without a certificate can reach an upstream behind a route that requires one. The request path must decode to an exempted URI, which bypasses the mutual TLS requirement.

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

## How to check

- Check the APISIX version: `apisix version`, affected range is `3.18.0` through `3.19.0`
- Look for `match_uri_encoded_slash` enabled and `skip_mtls_uri_regex` set in the APISIX configuration
- Review routes that require client certificates for any exempted URI patterns

## Fix

- Upgrade Apache APISIX to `3.20.0`

## Timeline

- 2026-11-13T18:49:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124723

## From the sources

Interpretation Conflict, leading to Incorrect Authorization vulnerability in Apache APISIX.



With match_uri_encoded_slash enabled and skip_mtls_uri_regex
configured, a client without a certificate can reach an upstream
behind a route that requires one, limited to request paths that decode
to an exempted URI. This issue affects Apache APISIX: from 3.18.0 through 3.19.0.



Users are recommended to upgrade to version 3.20.0, which fixes the issue.

---

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