{"id":"GHSA-g7jq-j257-rww2","summary":"OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body","details":"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.","aliases":["CVE-2026-49017","PYSEC-2026-3080"],"modified":"2026-07-13T16:43:07.382949863Z","published":"2026-05-27T03:30:31Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-07-01T18:04:11Z","nvd_published_at":"2026-05-27T02:16:34Z","cwe_ids":["CWE-835"]},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49017"},{"type":"WEB","url":"https://bugs.launchpad.net/bugs/2152205"},{"type":"PACKAGE","url":"https://github.com/openstack/swift"},{"type":"WEB","url":"https://review.opendev.org/c/openstack/swift/+/987957"},{"type":"WEB","url":"https://review.opendev.org/c/openstack/swift/+/988093"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/27/9"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/02/6"}],"affected":[{"package":{"name":"swift","ecosystem":"PyPI","purl":"pkg:pypi/swift"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.36.0"},{"last_affected":"2.36.1"}]}],"versions":["2.36.0","2.36.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-g7jq-j257-rww2/GHSA-g7jq-j257-rww2.json"}},{"package":{"name":"swift","ecosystem":"PyPI","purl":"pkg:pypi/swift"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.37.0"},{"last_affected":"2.37.1"}]}],"versions":["2.37.0","2.37.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-g7jq-j257-rww2/GHSA-g7jq-j257-rww2.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"}]}