CVE-2026-49017High▾ TwilightOpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 13.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.3%
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.
swift >= 2.36.0, <= 2.36.1swift >= 2.37.0, <= 2.37.1Refer to the advisory for the patched release.
Connected by shared product, vendor, weakness, or advisory.
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