---
cve: "CVE-2026-49017"
severity: "HIGH"
cvss: 7.1
epss: "32%"
vendor: "OpenStack"
kev: false
exploited: false
published: "2026-05-27 02:16:34"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T18:53:40+02:00"
---

# CVE-2026-49017

> 7.1 HIGH

## Beschreibung

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.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- bbd9c5e012d9f4821d67b9dfd538180de63e733b (Commit)
- f701907958c791f10ebb775690b9d21d39d92ae8 (Commit)

## Referenzen

- <https://bugs.launchpad.net/bugs/2152205>
- <https://review.opendev.org/c/openstack/swift/+/987957>
- <https://review.opendev.org/c/openstack/swift/+/988093>
- <http://www.openwall.com/lists/oss-security/2026/05/27/9>
- <http://www.openwall.com/lists/oss-security/2026/06/02/6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-49017) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_