{"id":"UBUNTU-CVE-2026-110314","details":"Client-Side Enforcement of Server-Side Security vulnerability in the WebSocket connection handling of mtrudel bandit allows a remote client to keep running WebSock handler code after the server has stopped its connection, via data frames sent after ignoring the server's Close frame. When a WebSock callback returns {:stop, ...}, Bandit.WebSocket.Connection calls terminate/2, sends Close and shuts down the write side, but keeps the connection process running in a :closing state. handle_frame/3 and handle_info/3 never check that state, so later frames still reach handle_in/2 and later messages reach handle_info/2, with the state from the stop tuple, until the client sends Close, TCP drops or the idle timeout fires. A client refused in init/1 after a failed token check could still run an admin-only action. This issue affects bandit: from 0.5.1 before 1.14.0.","modified":"2026-10-28T20:16:21.136638855Z","published":"2026-10-26T14:16:00Z","upstream":["CVE-2026-110314"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-110314"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-110314"},{"type":"REPORT","url":"https://cna.erlef.org/cves/cve-2026-110314.html"},{"type":"REPORT","url":"https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"type":"REPORT","url":"https://github.com/mtrudel/bandit/commit/bb407f2277dcb65a58dd8cc07913a0b58a80e266"},{"type":"REPORT","url":"https://github.com/mtrudel/bandit/security/advisories/ghsa-2v5v-8f9v-xh85"},{"type":"REPORT","url":"https://hex.pm/packages/bandit"},{"type":"REPORT","url":"https://github.com"},{"type":"REPORT","url":"https://github.com/mtrudel/bandit"},{"type":"REPORT","url":"https://repo.hex.pm"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/110xxx/cve-2026-110314.json"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-110314"},{"type":"REPORT","url":"https://osv.dev/vulnerability/eef-cve-2026-110314"}],"affected":[{"package":{"name":"bandit","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/bandit?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.2-1","0.13.2-3"],"ecosystem_specific":{"binaries":[{"binary_name":"bandit","binary_version":"0.13.2-3"},{"binary_version":"0.13.2-3","binary_name":"python-bandit"},{"binary_version":"0.13.2-3","binary_name":"python3-bandit"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110314.json"}},{"package":{"name":"bandit","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/bandit?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.0-0ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"bandit","binary_version":"1.4.0-0ubuntu2"},{"binary_name":"python-bandit","binary_version":"1.4.0-0ubuntu2"},{"binary_name":"python3-bandit","binary_version":"1.4.0-0ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110314.json"}},{"package":{"name":"bandit","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/bandit?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.1-3","1.6.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"bandit","binary_version":"1.6.2-1"},{"binary_version":"1.6.2-1","binary_name":"python3-bandit"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110314.json"}},{"package":{"name":"bandit","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/bandit?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"bandit","binary_version":"1.6.2-1"},{"binary_version":"1.6.2-1","binary_name":"python3-bandit"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110314.json"}},{"package":{"name":"bandit","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/bandit?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.2-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.6.2-3","binary_name":"bandit"},{"binary_name":"python3-bandit","binary_version":"1.6.2-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110314.json"}},{"package":{"name":"bandit","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/bandit?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.10-3","1.9.4-1"],"ecosystem_specific":{"binaries":[{"binary_name":"bandit","binary_version":"1.9.4-1"},{"binary_name":"python3-bandit","binary_version":"1.9.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110314.json"}},{"package":{"name":"bandit","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/bandit?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.10-2","1.7.10-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7.10-3","binary_name":"bandit"},{"binary_name":"python3-bandit","binary_version":"1.7.10-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110314.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubun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