Vulnerability Details 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. 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 37.6%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-49017
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cpe:2.3:a:openstack:swift:2.35.1
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cpe:2.3:a:openstack:swift:2.35.2
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cpe:2.3:a:openstack:swift:2.36.0
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cpe:2.3:a:openstack:swift:2.36.1
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cpe:2.3:a:openstack:swift:2.37.0
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cpe:2.3:a:openstack:swift:2.37.1