CVE-2026-49017
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductOpenstack Swift
PublishedMay 27, 2026
First seenMay 27, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- openstack swift2.35.3, 2.36.2, 2.37.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openstack swift | 2.35.1 ≤ v < 2.35.3, 2.36.0 ≤ v < 2.36.2, 2.37.0 ≤ v < 2.37.2 | 2.35.3, 2.36.2, 2.37.2 |
| swiftPyPI | 2.36.0 ≤ v ≤ 2.36.1, 2.37.0 ≤ v ≤ 2.37.1 | — |
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