---
id: CVE-2026-97404
title: >-
  In OpenStack Zaqar before 22.0.2, WSGI transport mishandles the URL-Signature
  header
summary: >-
  In OpenStack Zaqar before 22.0.2, WSGI transport mishandles the URL-Signature
  header. By sending a request with an empty URL-Signature header, an
  unauthenticated remote attacker who knows a target project's UUID may bypass
  both Keystone …
severity: critical
cvss: 9.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-348
vendor: OpenStack
product: Zaqar
affected:
  - Zaqar >= 1.0.0 < 20.1.2
  - Zaqar >= 21.0.0 < 21.0.2
  - Zaqar >= 22.0.0 < 22.0.2
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:08:22.573'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97404'
references:
  - url: 'https://launchpad.net/bugs/2164987'
    label: cve@mitre.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/24/6'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-24T15:45:56.650Z'
---

## Overview

In OpenStack Zaqar before 22.0.2, WSGI transport mishandles the URL-Signature header. By sending a request with an empty URL-Signature header, an unauthenticated remote attacker who knows a target project's UUID may bypass both Keystone authentication and pre-signed URL verification, resulting in the ability to read, enumerate, create, and delete that project's queues, messages, claims, and subscriptions. By additionally claiming an administrative role, the attacker may also perform administrative operations, such as managing pools and flavors in admin_mode deployments. Only deployments using the WSGI transport with an authentication strategy configured are affected; the websocket transport is not affected.

## Remediation

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