VULNERABILITY INTELLIGENCE

CVE-2026-49017

CVSS score6.5 MEDIUM
EPSS probability0.36%
CISA KEVNot currently listed
Published2026-05-27
Last modified2026-09-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • cve@mitre.org: CWE-835

Primary references