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.
Metrics
Affected Vendors & Products
References
History
Wed, 27 May 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Wed, 27 May 2026 02:15:00 +0000
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| 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. | |
| First Time appeared |
Openstack
Openstack swift |
|
| Weaknesses | CWE-835 | |
| CPEs | cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Openstack
Openstack swift |
|
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: mitre
Published: 2026-05-27T01:57:58.831Z
Updated: 2026-05-27T13:52:55.767Z
Reserved: 2026-05-27T01:57:58.189Z
Link: CVE-2026-49017
Updated: 2026-05-27T13:52:52.280Z
Status : Received
Published: 2026-05-27T02:16:34.327
Modified: 2026-05-27T02:16:34.327
Link: CVE-2026-49017
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