---
id: CVE-2026-88829
title: A flaw was found in BusyBox httpd's reverse proxy feature
summary: >-
  A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is
  configured to forward requests matching a URL prefix to a backend server, only
  the first HTTP request on a TCP connection has its path rewritten. An attacker
  ca…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-444
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:57.077'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88829'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88829'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2531343'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88829.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-88829'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88829'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-10-14T10:25:41.202Z'
vendor: Red Hat
product: Red Hat Hardened Images
affected:
  - hardened_images
---

## Overview

A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88829.json)