{"id":"USN-8893-1","summary":"libwebsockets vulnerabilities","details":"It was discovered that libwebsockets did not properly validate\nuser-supplied data when parsing HTTP/2 HPACK path headers, which could\nresult in a write past the end of an allocated buffer. An attacker could\npossibly use this issue to execute arbitrary code. (CVE-2026-19773)\n\nIt was discovered that libwebsockets did not properly handle CBOR\nrecording in the LECP parser, which could result in a write past the end\nof an allocated buffer. An attacker could possibly use this issue to\ncause a crash or execute arbitrary code. (CVE-2026-78161)","modified":"2026-10-08T12:58:05.069798336Z","published":"2026-10-07T10:05:38Z","related":["UBUNTU-CVE-2026-19773"],"upstream":["CVE-2026-19773","UBUNTU-CVE-2026-19773"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8893-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-19773"}],"affected":[{"package":{"name":"libwebsockets","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.1-1ubuntu0.1~esm1"}]}],"versions":["1.2.2-1","1.6.0-3","1.6.0-4","1.6.0-5","1.6.1-1","1.7.0-1ubuntu1","1.7.0-2","1.7.1-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"1.7.1-1ubuntu0.1~esm1","binary_name":"libwebsockets-test-server"},{"binary_name":"libwebsockets-test-server-common","binary_version":"1.7.1-1ubuntu0.1~esm1"},{"binary_name":"libwebsockets7","binary_version":"1.7.1-1ubuntu0.1~esm1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-19773","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"}},{"package":{"name":"libwebsockets","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.3-3ubuntu0.1~esm1"}]}],"versions":["2.0.3-3","2.0.3-3build1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libwebsockets-test-server","binary_version":"2.0.3-3ubuntu0.1~esm1"},{"binary_version":"2.0.3-3ubuntu0.1~esm1","binary_name":"libwebsockets-test-server-common"},{"binary_name":"libwebsockets8","binary_version":"2.0.3-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2026-19773","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"libwebsockets","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.1-3ubuntu0.1~esm3"}]}],"versions":["2.0.3-3build1","3.2.1-3","3.2.1-3ubuntu0.1~esm1","3.2.1-3ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libwebsockets-test-server","binary_version":"3.2.1-3ubuntu0.1~esm3"},{"binary_version":"3.2.1-3ubuntu0.1~esm3","binary_name":"libwebsockets-test-server-common"},{"binary_version":"3.2.1-3ubuntu0.1~esm3","binary_name":"libwebsockets15"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-19773","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"}},{"package":{"name":"libwebsockets","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.20-2ubuntu1.1+esm2"}]}],"versions":["4.0.20-2","4.0.20-2ubuntu1","4.0.20-2ubuntu1.1","4.0.20-2ubuntu1.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libwebsockets-test-server","binary_version":"4.0.20-2ubuntu1.1+esm2"},{"binary_version":"4.0.20-2ubuntu1.1+esm2","binary_name":"libwebsockets-test-server-common"},{"binary_version":"4.0.20-2ubuntu1.1+esm2","binary_name":"libwebsockets16"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-19773","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"}},{"package":{"name":"libwebsockets","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.3-1.1ubuntu0.1~esm3"}]}],"versions":["4.3.2-4","4.3.3-1","4.3.3-1.1build1","4.3.3-1.1build2","4.3.3-1.1build3","4.3.3-1.1ubuntu0.1~esm1","4.3.3-1.1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"4.3.3-1.1ubuntu0.1~esm3","binary_name":"libwebsockets-evlib-ev"},{"binary_version":"4.3.3-1.1ubuntu0.1~esm3","binary_name":"libwebsockets-evlib-glib"},{"binary_name":"libwebsockets-evlib-uv","binary_version":"4.3.3-1.1ubuntu0.1~esm3"},{"binary_version":"4.3.3-1.1ubuntu0.1~esm3","binary_name":"libwebsockets-test-server"},{"binary_name":"libwebsockets-test-server-common","binary_version":"4.3.3-1.1ubuntu0.1~esm3"},{"binary_name":"libwebsockets19t64","binary_version":"4.3.3-1.1ubuntu0.1~esm3"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:24.04:LTS","cves":[{"id":"CVE-2026-19773","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json"}},{"package":{"name":"libwebsockets","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/libwebsockets?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.5-3ubuntu1.2+esm1"}]}],"versions":["4.3.5-1","4.3.5-3","4.3.5-3ubuntu1","4.3.5-3ubuntu1.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libwebsockets-evlib-ev","binary_version":"4.3.5-3ubuntu1.2+esm1"},{"binary_name":"libwebsockets-evlib-glib","binary_version":"4.3.5-3ubuntu1.2+esm1"},{"binary_version":"4.3.5-3ubuntu1.2+esm1","binary_name":"libwebsockets-evlib-uv"},{"binary_name":"libwebsockets-test-server","binary_version":"4.3.5-3ubuntu1.2+esm1"},{"binary_name":"libwebsockets-test-server-common","binary_version":"4.3.5-3ubuntu1.2+esm1"},{"binary_version":"4.3.5-3ubuntu1.2+esm1","binary_name":"libwebsockets19t64"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8893-1.json","cves_map":{"cves":[{"id":"CVE-2026-19773","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:26.04:LTS"}}}],"schema_version":"1.9.0"}