---
id: "CVE-2026-114457"
kind: "vulnerability"
aliases: ["CVE-2026-114457"]
title: "mod_qos: crafted JSON request crashes Apache worker process"
severity: "low"
cvss: 3.7
epss: 0.0028
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["apache", "mod_qos", "runtime", "self-hosted"]
not_affected_if: ["default-config", "no-mod_qos"]
published_at: "2026-10-22T07:16:42+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T04:43:24+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114457", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-114457", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# mod_qos: crafted JSON request crashes Apache worker process

mod_qos, an Apache module, reads past allocated memory when it processes percent-encoded input in JSON body filtering. An unauthenticated remote attacker can send a crafted JSON request to crash an Apache worker process, causing denial of service.

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

## How to check

- Check whether the `mod_qos` module is loaded in the Apache configuration (`apachectl -M | grep qos`).
- Check whether JSON body filtering is enabled in the mod_qos configuration (unknown which directive the sources name).

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114457
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-114457

## From the sources

A flaw was found in mod_qos. An unauthenticated remote attacker could cause a Denial of Service (DoS) by sending a specially crafted JSON request when JSON body filtering is enabled. Due to improper string termination during the processing of percent-encoded input, the module reads past allocated memory boundaries, which can cause an Apache worker process to crash.

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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_