{"schemaVersion":3,"id":"CVE-2026-1760","aliases":["UBUNTU-CVE-2026-1760","DEBIAN-CVE-2026-1760"],"status":"published","duplicateOf":null,"title":null,"description":"A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.","dates":{"published":"2026-02-02T14:01:26.762Z","modified":"2026-03-19T14:20:22.488Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":10,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":10,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0048,"percentile":0.4039,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.03099999999999995,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00449},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00439,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00439,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00439,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00439,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00439,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00439,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00439,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.0048,"percentile":0.4039}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00449,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0048,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.0048,"percentile":0.4039}]},"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-444","name":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","description":"The product acts as an intermediary HTTP agent\n         (such as a proxy or firewall) in the data flow between two\n         entities such as a client and server, but it does not\n         interpret malformed HTTP requests or responses in ways that\n         are consistent with how the messages will be processed by\n         those entities that are at the ultimate destination.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/444.html"}],"affected":[{"vendor":"debian","product":"libsoup2.4","name":"libsoup2.4","label":"libsoup2.4","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libsoup2.4","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"debian","product":"libsoup3","name":"libsoup3","label":"libsoup3","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libsoup3","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 3.6.5-8","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 3.6.5-8","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libsoup2.4","name":"libsoup2.4","label":"libsoup2.4","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libsoup2.4","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libsoup3","name":"libsoup3","label":"libsoup3","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libsoup3","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-1760","label":"access.redhat.com/security/cve/CVE-2026-1760","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","REPORT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2435951","label":"bugzilla.redhat.com/show_bug.cgi?id=2435951","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/475","label":"gitlab.gnome.org/GNOME/libsoup/-/issues/475","hostname":"gitlab.gnome.org","tags":[]},{"url":"https://ubuntu.com/security/CVE-2026-1760","label":"ubuntu.com/security/CVE-2026-1760","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-1760","label":"www.cve.org/CVERecord?id=CVE-2026-1760","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-1760","label":"security-tracker.debian.org/tracker/CVE-2026-1760","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1760","label":"nvd.nist.gov/vuln/detail/CVE-2026-1760","hostname":"nvd.nist.gov","tags":["Oval","Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:10276-1","OPENSUSE-SU-2026:10291-1","OPENSUSE-SU-2026:20354-1","OPENSUSE-SU-2026:20384-1","SUSE-SU-2026:0788-1","SUSE-SU-2026:0792-1","SUSE-SU-2026:0796-1","SUSE-SU-2026:0811-1","SUSE-SU-2026:0833-1","SUSE-SU-2026:0834-1","SUSE-SU-2026:20649-1","SUSE-SU-2026:20727-1","SUSE-SU-2026:20752-1","SUSE-SU-2026:20902-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:10276-1","OPENSUSE-SU-2026:10291-1","OPENSUSE-SU-2026:20354-1","OPENSUSE-SU-2026:20384-1","SUSE-SU-2026:0788-1","SUSE-SU-2026:0792-1","SUSE-SU-2026:0796-1","SUSE-SU-2026:0811-1","SUSE-SU-2026:0833-1","SUSE-SU-2026:0834-1","SUSE-SU-2026:20649-1","SUSE-SU-2026:20727-1","SUSE-SU-2026:20752-1","SUSE-SU-2026:20902-1"]},"timeline":[{"kind":"published","date":"2026-02-02T14:01:26.762Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-03-19T14:20:22.488Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T23:14:36.020Z","stale":false,"partial":false}}