---
cve: "CVE-2026-71191"
severity: "MEDIUM"
cvss: 6.0
epss: "0.3%"
vendor: "OpenStack"
kev: false
exploited: false
published: "2026-08-05 06:16:40"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T13:46:46+02:00"
---

# CVE-2026-71191

> 6.0 MEDIUM

## Beschreibung

In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy from an arbitrary source object using the signer's authorization context. The attacker can read any object the signer has access to, provided the target project_id, container name, and object name are known. This affects all deployments using the default s3_acl=false configuration.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- fc875f93e82edf98805d0eead3e3c961673c3ef8 (Commit)
- deaa3e4691bb19224f5ef57e7fbcd08b7eff5277 (Commit)

## Referenzen

- <https://launchpad.net/bugs/2158733>
- <https://openwall.com/lists/oss-security/2026/07/28/26>
- <https://security.openstack.org/ossa/OSSA-2026-030.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-71191) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_