Vulnerability 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.
Related Weaknesses (CWE)
References
- 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
FAQ
What is CVE-2026-49017?
CVE-2026-49017 is a documented vulnerability. 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 buf...
How severe is CVE-2026-49017?
CVSS scoring is not yet available for CVE-2026-49017. Check NVD for updates.
Is there a patch for CVE-2026-49017?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.