{"schemaVersion":3,"id":"CVE-2026-49017","aliases":["GHSA-g7jq-j257-rww2","PYSEC-2026-3080","UBUNTU-CVE-2026-49017","USN-8821-1","DEBIAN-CVE-2026-49017"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-05-27T01:57:58.831Z","modified":"2026-06-02T17:33:08.620Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Pypi","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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","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","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":7.2,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":7.2,"impact":6,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00358,"percentile":0.28076,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.03599999999999996,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00322},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00466,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00358,"percentile":0.28076}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00322,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00466,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00358,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00358,"percentile":0.28076}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-835","name":"Loop with Unreachable Exit Condition ('Infinite Loop')","description":"The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/835.html"}],"affected":[{"vendor":"debian","product":"swift","name":"swift","label":"swift","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/swift","purlType":"deb","versions":[{"text":"< 2.35.1-0+deb13u2","noFixRecorded":false,"fixedIn":null},{"text":"< 2.37.1-4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.35.1-0+deb13u2 | < 2.37.1-4","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"swift","name":"swift","label":"swift","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/swift","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.37.1-0ubuntu2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.37.1-0ubuntu2.1","eol":null,"hubHref":null},{"vendor":"openstack","product":"swift","name":"swift","label":"swift","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.35.1, < 2.35.3","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.36.0, < 2.36.2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.37.0, < 2.37.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.35.1, < 2.35.3 | ≥ 2.36.0, < 2.36.2 | ≥ 2.37.0, < 2.37.2","eol":null,"hubHref":"/vendor/openstack/swift"},{"vendor":"PyPI","product":"swift","name":"swift","label":"swift","ecosystem":"PyPI","cpePart":null,"purl":"pkg:pypi/swift","purlType":"pypi","versions":[{"text":"≥ 2.36.0, ≤ 2.36.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.37.0, ≤ 2.37.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.36.0, ≤ 2.36.1 | ≥ 2.37.0, ≤ 2.37.1","eol":null,"hubHref":null}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://bugs.launchpad.net/bugs/2152205","label":"bugs.launchpad.net/bugs/2152205","hostname":"bugs.launchpad.net","tags":["Issue Tracking","WEB","Vendor Advisory"]},{"url":"https://review.opendev.org/c/openstack/swift/+/987957","label":"review.opendev.org/c/openstack/swift/+/987957","hostname":"review.opendev.org","tags":["Patch","WEB","REPORT","Issue Tracking"]},{"url":"https://review.opendev.org/c/openstack/swift/+/988093","label":"review.opendev.org/c/openstack/swift/+/988093","hostname":"review.opendev.org","tags":["Technical Description","WEB","REPORT","Issue Tracking","Patch"]},{"url":"http://www.openwall.com/lists/oss-security/2026/05/27/9","label":"www.openwall.com/lists/oss-security/2026/05/27/9","hostname":"www.openwall.com","tags":["WEB","Mailing List","Patch","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/06/02/6","label":"www.openwall.com/lists/oss-security/2026/06/02/6","hostname":"www.openwall.com","tags":["WEB","Mailing List","Patch","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49017","label":"nvd.nist.gov/vuln/detail/CVE-2026-49017","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/openstack/swift","label":"github.com/openstack/swift","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://pypi.org/project/swift","label":"pypi.org/project/swift","hostname":"pypi.org","tags":["PACKAGE"]},{"url":"https://github.com/advisories/GHSA-g7jq-j257-rww2","label":"github.com/advisories/GHSA-g7jq-j257-rww2","hostname":"github.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-49017","label":"ubuntu.com/security/CVE-2026-49017","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-49017","label":"www.cve.org/CVERecord?id=CVE-2026-49017","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8821-1","label":"ubuntu.com/security/notices/USN-8821-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-49017","label":"security-tracker.debian.org/tracker/CVE-2026-49017","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-05-27T01:57:58.831Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-02T17:33:08.620Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":28,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T01:09:11.120Z","stale":false,"partial":false}}