# CVE-2026-71191: swift: In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the...

CVE-2026-71191 is fixed in swift on 1 platform, first by DEBIAN-CVE-2026-71191, released August 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-71191
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0056
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 5, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | swift Debian 12.15 (bookworm) | 2.30.1-0+deb12u3 | [DEBIAN-CVE-2026-71191](https://patchblox.com/security/data/fix/linux/debian-cve-2026-71191.md) | Aug 5, 2026 |
| Linux | swift Debian 13.5 (trixie) | 2.35.1-0+deb13u3 | [DEBIAN-CVE-2026-71191](https://patchblox.com/security/data/fix/linux/debian-cve-2026-71191.md) | Aug 5, 2026 |
| Linux | swift Debian 14 | 2.37.1-6 | [DEBIAN-CVE-2026-71191](https://patchblox.com/security/data/fix/linux/debian-cve-2026-71191.md) | Aug 5, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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