CVE-2026-49017
mediumpriority · track · 26EPSS 0.004 · 29 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (8)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-g7jq-j257-rww2OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body2026-05-27ghsa · osvUS
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.
- PYSEC-2026-3080OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body2026-07-13vendor · osvUS
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.
also known as (6)
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sources
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references (13)
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/05/27/9cnnvd
- https://bugs.launchpad.net/bugs/2152205cnnvd
- https://docs.openstack.org/swift/latest/#Patchcnnvd
- https://review.opendev.org/c/openstack/swift/+/987957cnnvd
- https://review.opendev.org/c/openstack/swift/+/988093cnnvd
- https://bugs.launchpad.net/bugs/2152205enisa_euvd
- https://review.opendev.org/c/openstack/swift/+/987957enisa_euvd
- https://review.opendev.org/c/openstack/swift/+/988093enisa_euvd
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