{"id":"CVE-2026-49017","aliases":["GHSA-g7jq-j257-rww2","PYSEC-2026-3080"],"title":"OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body","summary":"OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body","severity":"high","vendor":"swift","product":"swift","ecosystem":"pip","affected":["swift >= 2.36.0, <= 2.36.1","swift >= 2.37.0, <= 2.37.1"],"published":"2026-05-27","updated":"2026-07-13","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-g7jq-j257-rww2","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49017"},{"url":"https://bugs.launchpad.net/bugs/2152205"},{"url":"https://github.com/openstack/swift"},{"url":"https://review.opendev.org/c/openstack/swift/+/987957"},{"url":"https://review.opendev.org/c/openstack/swift/+/988093"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/27/9"},{"url":"http://www.openwall.com/lists/oss-security/2026/06/02/6"}],"tags":["osv","pip"],"epss":0.00322,"epssPercentile":0.25351,"ingestedAt":"2026-07-13T18:57:58.136Z","slug":"CVE-2026-49017","body":"## Overview\n\nIn 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.\n\n## Affected packages\n\n- `swift >= 2.36.0, <= 2.36.1`\n- `swift >= 2.37.0, <= 2.37.1`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}