{"id":"CVE-2026-49017","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":["GHSA-g7jq-j257-rww2","PYSEC-2026-3080"],"modified":"2026-07-15T01:48:52.024670206Z","published":"2026-05-27T01:57:58.831Z","database_specific":{"cwe_ids":["CWE-835"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49017.json","cna_assigner":"mitre"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://opendev.org/openstack/swift","events":[{"introduced":"82cb5a5d78b91c6af258cd8f06d30f69be90fa18"},{"fixed":"bbd9c5e012d9f4821d67b9dfd538180de63e733b"},{"introduced":"555026d200337b39c97eb9dafd26901ff40c7a1d"},{"fixed":"f701907958c791f10ebb775690b9d21d39d92ae8"},{"introduced":"9ae4dd3321a6f3e410c8221efd27814a1dfd2ece"},{"fixed":"980b5b6987fa8d4ea5cdfa8256b00430d8bfc2d1"}],"database_specific":{"extracted_events":[{"introduced":"2.36.0"},{"fixed":"2.36.2"},{"introduced":"2.37.0"},{"fixed":"2.37.2"},{"introduced":"2.35.1"},{"fixed":"2.35.3"}],"source":"AFFECTED_FIELD"}}],"versions":["2.35.2","2.36.1","2.37.1","2.37.0","2.36.0","2.35.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49017.json"}}],"schema_version":"1.7.5","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"}]}