{"id":"CVE-2026-49017","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-49017","generatedAt":"2026-10-28T04:11:24.175Z","title":"An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service.","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.","published":"2026-05-27T02:16:34.000Z","lastModified":"2026-09-24T17:25:35.000Z","status":"Analyzed","sourceIdentifier":"cve@mitre.org","cvss":{"version":"4.0","score":7.1,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-835"],"affected":["openstack/swift"],"epss":{"score":0.00358,"percentile":0.29359,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://bugs.launchpad.net/bugs/2152205","tags":["Issue Tracking","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://review.opendev.org/c/openstack/swift/+/987957","tags":["Issue Tracking","Patch"],"source":"cve@mitre.org"},{"url":"https://review.opendev.org/c/openstack/swift/+/988093","tags":["Issue Tracking","Patch"],"source":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/27/9","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2026/06/02/6","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-49017","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}