---
id: CVE-2026-94571
title: >-
  In OpenStack Octavia before 18.0.1, the Amphora provider driver did not reject
  control characters in the L7 policy redirect_url and redirect_prefix fields
summary: >-
  In OpenStack Octavia before 18.0.1, the Amphora provider driver did not reject
  control characters in the L7 policy redirect_url and redirect_prefix fields.
  The RFC 3986 URL validator percent-encodes control characters before
  validating, …
severity: critical
cvss: 9.4
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'
cwe:
  - CWE-94
vendor: OpenStack
product: Octavia
affected:
  - Octavia >= 0.8.0 < 16.1.0
  - Octavia >= 17.0.0 < 17.0.1
  - Octavia >= 18.0.0 < 18.0.1
published: '2026-09-21'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:56:19.073'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94571'
references:
  - url: 'https://bugs.debian.org/1148175'
    label: cve@mitre.org
  - url: 'https://bugs.launchpad.net/octavia/+bug/2162103'
    label: cve@mitre.org
  - url: 'https://bugs.launchpad.net/octavia/+bug/2167565'
    label: cve@mitre.org
  - url: >-
      https://opendev.org/openstack/octavia/commit/bad7074621562d90a38be4639c1ab3e245f5bf39
    label: cve@mitre.org
  - url: 'https://openwall.com/lists/oss-security/2026/09/21/6'
    label: cve@mitre.org
  - url: 'https://security.openstack.org/ossa/OSSA-2026-039.html'
    label: cve@mitre.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94571.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-94571'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2538157'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-94571'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94571'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00534
epssPercentile: 0.44897
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-22T13:36:29.022324Z'
cvssSource: cna
ingestedAt: '2026-09-21T20:52:58.302Z'
scores:
  cna: 9.4
  vendor: 5
---

## Overview

In OpenStack Octavia before 18.0.1, the Amphora provider driver did not reject control characters in the L7 policy redirect_url and redirect_prefix fields. The RFC 3986 URL validator percent-encodes control characters before validating, and thus newlines passed structural checks, but Octavia stored and wrote the raw unencoded value directly into the HAProxy configuration generated on the amphora. An authenticated project member who owns a load balancer can therefore inject arbitrary HAProxy directives through a REDIRECT_TO_URL L7 policy. Only deployments using the Amphora provider are affected.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · no fix planned: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94571.json)