OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-49017US | medium6.5 | — | ||
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… | ||||
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/05/27/9WEB
- http://www.openwall.com/lists/oss-security/2026/06/02/6WEB
- https://bugs.launchpad.net/bugs/2152205WEB
- https://github.com/advisories/GHSA-g7jq-j257-rww2ADVISORY
- https://github.com/openstack/swiftPACKAGE
- https://nvd.nist.gov/vuln/detail/CVE-2026-49017ADVISORY
- https://pypi.org/project/swiftPACKAGE
- https://review.opendev.org/c/openstack/swift/+/987957WEB
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