high7.1
CVE-2026-49017
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.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | swift | >= 2.36.0, <= 2.36.1 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openstack | Swift | from 2.35.1 before 2.35.3 from 2.36.0 before 2.36.2 from 2.37.0 before 2.37.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-g7jq-j257-rww2
- https://nvd.nist.gov/vuln/detail/CVE-2026-49017
- 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