{"schemaVersion":3,"id":"CVE-2026-15711","aliases":["RHSA-2026:68266","UBUNTU-CVE-2026-15711","DEBIAN-CVE-2026-15711"],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.","dates":{"published":"2026-07-14T19:45:47.784Z","modified":"2026-09-24T09:37:08.949Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","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:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Red hat","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00745,"percentile":0.5423,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.263,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00482},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00431,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00431,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00431,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0046,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00471,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00471,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00471,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00482,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00548,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00548,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00745,"percentile":0.5423}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00482,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00548,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00548,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00745,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00745,"percentile":0.5423}]},"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-770","name":"Allocation of Resources Without Limits or Throttling","description":"The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/770.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":"< 3.8.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 3.8.0-1","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},{"vendor":"redhat","product":"libsoup","name":"libsoup","label":"libsoup","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/libsoup","purlType":"rpm","versions":[{"text":"< 0:2.62.3-15.el8_10","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:2.62.3-15.el8_10","eol":null,"hubHref":null},{"vendor":"redhat","product":"libsoup-debuginfo","name":"libsoup-debuginfo","label":"libsoup-debuginfo","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/libsoup-debuginfo","purlType":"rpm","versions":[{"text":"< 0:2.62.3-15.el8_10","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:2.62.3-15.el8_10","eol":null,"hubHref":null},{"vendor":"redhat","product":"libsoup-debugsource","name":"libsoup-debugsource","label":"libsoup-debugsource","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/libsoup-debugsource","purlType":"rpm","versions":[{"text":"< 0:2.62.3-15.el8_10","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:2.62.3-15.el8_10","eol":null,"hubHref":null},{"vendor":"redhat","product":"libsoup-devel","name":"libsoup-devel","label":"libsoup-devel","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/libsoup-devel","purlType":"rpm","versions":[{"text":"< 0:2.62.3-15.el8_10","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:2.62.3-15.el8_10","eol":null,"hubHref":null}],"affectedCount":8,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:68234","label":"access.redhat.com/errata/RHSA-2026:68234","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:68235","label":"access.redhat.com/errata/RHSA-2026:68235","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:68266","label":"access.redhat.com/errata/RHSA-2026:68266","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT","Advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:68612","label":"access.redhat.com/errata/RHSA-2026:68612","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:69108","label":"access.redhat.com/errata/RHSA-2026:69108","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:69297","label":"access.redhat.com/errata/RHSA-2026:69297","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:69863","label":"access.redhat.com/errata/RHSA-2026:69863","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70598","label":"access.redhat.com/errata/RHSA-2026:70598","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70599","label":"access.redhat.com/errata/RHSA-2026:70599","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:71389","label":"access.redhat.com/errata/RHSA-2026:71389","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-15711","label":"access.redhat.com/security/cve/CVE-2026-15711","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","REPORT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2499924","label":"bugzilla.redhat.com/show_bug.cgi?id=2499924","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT","REPORT"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/515","label":"gitlab.gnome.org/GNOME/libsoup/-/issues/515","hostname":"gitlab.gnome.org","tags":["ARTICLE","REPORT"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","label":"access.redhat.com/security/updates/classification/","hostname":"access.redhat.com","tags":["ARTICLE"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_68266.json","label":"security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_68266.json","hostname":"security.access.redhat.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-15711","label":"www.cve.org/CVERecord?id=CVE-2026-15711","hostname":"www.cve.org","tags":["Advisory","REPORT"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15711","label":"nvd.nist.gov/vuln/detail/CVE-2026-15711","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-15711","label":"ubuntu.com/security/CVE-2026-15711","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-15711","label":"security-tracker.debian.org/tracker/CVE-2026-15711","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:12084-1","RHSA-2026:68234","RHSA-2026:68235","RHSA-2026:68612","RHSA-2026:69108","RHSA-2026:69297","RHSA-2026:69863","RHSA-2026:70598","RHSA-2026:70599","RHSA-2026:71389","SUSE-SU-2026:4557-1","SUSE-SU-2026:4558-1","SUSE-SU-2026:4690-1","SUSE-SU-2026:4703-1","SUSE-SU-2026:4739-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:12084-1","SUSE-SU-2026:4557-1","SUSE-SU-2026:4558-1","SUSE-SU-2026:4690-1","SUSE-SU-2026:4703-1","SUSE-SU-2026:4739-1"]},"timeline":[{"kind":"published","date":"2026-07-14T19:45:47.784Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-24T09:37:08.949Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T19:55:24.568Z","stale":false,"partial":false}}