# CVE-2026-49017: swift: In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws...

CVE-2026-49017 is fixed in 7 products on 1 platform, first by python3-swift 2.37.1-0ubuntu2.1, released May 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-49017
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 26, 2026

## Description

In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python3-swift Ubuntu 26.04.1 LTS (resolute) | 2.37.1-0ubuntu2.1 | [python3-swift 2.37.1-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-swift-2.37.1-0ubuntu2.1.md) | May 26, 2026 |
| Linux | swift Debian 13.5 (trixie) | 2.35.1-0+deb13u2 | [DEBIAN-CVE-2026-49017](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49017.md) | Jun 24, 2026 |
| Linux | swift Debian 14 | 2.37.1-4 | [DEBIAN-CVE-2026-49017](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49017.md) | Jun 24, 2026 |
| Linux | swift Ubuntu 26.04.1 LTS (resolute) | 2.37.1-0ubuntu2.1 | [swift 2.37.1-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-swift-2.37.1-0ubuntu2.1.md) | May 26, 2026 |
| Linux | swift-account Ubuntu 26.04.1 LTS (resolute) | 2.37.1-0ubuntu2.1 | [swift-account 2.37.1-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-swift-account-2.37.1-0ubuntu2.1.md) | May 26, 2026 |
| Linux | swift-container Ubuntu 26.04.1 LTS (resolute) | 2.37.1-0ubuntu2.1 | [swift-container 2.37.1-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-swift-container-2.37.1-0ubuntu2.1.md) | May 26, 2026 |
| Linux | swift-object Ubuntu 26.04.1 LTS (resolute) | 2.37.1-0ubuntu2.1 | [swift-object 2.37.1-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-swift-object-2.37.1-0ubuntu2.1.md) | May 26, 2026 |
| Linux | swift-object-expirer Ubuntu 26.04.1 LTS (resolute) | 2.37.1-0ubuntu2.1 | [swift-object-expirer 2.37.1-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-swift-object-expirer-2.37.1-0ubuntu2.1.md) | May 26, 2026 |
| Linux | swift-proxy Ubuntu 26.04.1 LTS (resolute) | 2.37.1-0ubuntu2.1 | [swift-proxy 2.37.1-0ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-swift-proxy-2.37.1-0ubuntu2.1.md) | May 26, 2026 |

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Data as of 2026-11-08T06:59:42Z 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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