{"cve":"CVE-2026-49017","nvd":{"published":"2026-05-27T02:16:34.327","modified":"2026-09-24T17:25:35.187","status":"Analyzed","description":"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.","cvss_v4":{"vector":"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","score":7.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-835"],"references":["https://bugs.launchpad.net/bugs/2152205","https://review.opendev.org/c/openstack/swift/+/987957","https://review.opendev.org/c/openstack/swift/+/988093","http://www.openwall.com/lists/oss-security/2026/05/27/9","http://www.openwall.com/lists/oss-security/2026/06/02/6"],"products":["openstack:swift"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-49017","score":0.00358,"percentile":0.29565,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-g7jq-j257-rww2","url":"https://osv.dev/vulnerability/GHSA-g7jq-j257-rww2","summary":"OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body","modified":"2026-07-13T16:43:07.382949863Z","packages":[{"ecosystem":"PyPI","name":"swift","purl":"pkg:pypi/swift","ranges":[">=2.36.0 <=2.36.1"],"fixed":[]},{"ecosystem":"PyPI","name":"swift","purl":"pkg:pypi/swift","ranges":[">=2.37.0 <=2.37.1"],"fixed":[]}]},{"id":"PYSEC-2026-3080","url":"https://osv.dev/vulnerability/PYSEC-2026-3080","summary":"OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body","modified":"2026-07-13T16:33:13.255199366Z","packages":[{"ecosystem":"PyPI","name":"swift","purl":"pkg:pypi/swift","ranges":[">=2.36.0 <=2.36.1",">=2.37.0 <=2.37.1"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}