{"id":"CVE-2026-49017","aliases":["GHSA-g7jq-j257-rww2","PYSEC-2026-3080"],"url":"https://o3.security/vulnerability/CVE-2026-49017","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.","published":"2026-05-27T01:57:58.831Z","modified":"2026-08-12T03:51:15.420291527Z","cvss":null,"epss":{"score":0.00322,"percentile":0.24418,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"swift","fixedVersion":null},{"ecosystem":"PyPI","name":"swift","fixedVersion":null}],"fix":null,"references":[{"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"},{"type":"WEB","url":"https://opendev.org/openstack/swift"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49017.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49017"},{"type":"REPORT","url":"https://bugs.launchpad.net/bugs/2152205"},{"type":"FIX","url":"https://review.opendev.org/c/openstack/swift/+/987957"},{"type":"ARTICLE","url":"https://review.opendev.org/c/openstack/swift/+/988093"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:15.420291527Z"}}