---
id: CVE-2026-71192
title: >-
  In OpenStack Swift through 2.38.0, the S3API middleware does not sanitize
  Swift-native control headers (X-Copy-From, X-Copy-From-Account) from S3 API
  requests when s3_acl=true
summary: >-
  In OpenStack Swift through 2.38.0, the S3API middleware does not sanitize
  Swift-native control headers (X-Copy-From, X-Copy-From-Account) from S3 API
  requests when s3_acl=true. An

  attacker can inject these headers into a signed PUT reque…
severity: none
cwe:
  - CWE-863
published: '2026-08-05'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:03:22.897'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71192'
references:
  - url: 'https://launchpad.net/bugs/2158733'
    label: cve@mitre.org
  - url: 'https://openwall.com/lists/oss-security/2026/07/28/26'
    label: cve@mitre.org
  - url: 'https://security.openstack.org/ossa/OSSA-2026-030.html'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00292
epssPercentile: 0.21984
ingestedAt: '2026-09-09T16:14:05.512Z'
---

## Overview

In OpenStack Swift through 2.38.0, the S3API middleware does not sanitize Swift-native control headers (X-Copy-From, X-Copy-From-Account) from S3 API requests when s3_acl=true. An
attacker can inject these headers into a signed PUT request targeting their own bucket, causing Swift to perform a server-side copy from another tenant's private object. The source object authorization is bypassed because the S3API middleware has already authorized the request against the destination. The attacker can read any object whose project_id, container name, and object name are known, regardless of the source object's ACLs or ownership. This requires the non-default s3_acl=true configuration.

## Remediation

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