{"id":"UBUNTU-CVE-2026-114216","details":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to smuggle a second request past a front-end proxy via a chunk extension that contains a bare LF. The chunked reader in lib/bandit/http1/socket.ex takes the chunk-size line to be everything up to the first CRLF and discards everything after ; without checking it against the RFC 9112 chunk-ext grammar, so bare LF, bare CR and other control bytes pass. A proxy that ends the size line at a bare LF reads 2;\\nxx\\r\\n40\\r\\n... as one request whose second chunk holds a GET /admin, while Bandit ends the body early and dispatches GET /admin as a separate pipelined request. Deployments without such a proxy in front of Bandit are not affected. This issue affects bandit: from 1.12.4 before 1.14.0.","modified":"2026-10-28T20:17:45.512411907Z","published":"2026-10-26T14:16:00Z","upstream":["CVE-2026-114216"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-114216"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-114216"},{"type":"REPORT","url":"https://cna.erlef.org/cves/cve-2026-114216.html"},{"type":"REPORT","url":"https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"type":"REPORT","url":"https://github.com/mtrudel/bandit/commit/c31e9e3c76dcbfc239a96eabed5341ced7885ae5"},{"type":"REPORT","url":"https://github.com/mtrudel/bandit/security/advisories/ghsa-w5wc-g2hc-g7m2"},{"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/2026/114xxx/cve-2026-114216.json"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-114216"},{"type":"REPORT","url":"https://osv.dev/vulnerability/eef-cve-2026-114216"}],"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_name":"python-bandit","binary_version":"0.13.2-3"},{"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-2026-114216.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-2026-114216.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_name":"python3-bandit","binary_version":"1.6.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-114216.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_name":"python3-bandit","binary_version":"1.6.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-114216.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_name":"bandit","binary_version":"1.6.2-3"},{"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-2026-114216.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_version":"1.9.4-1","binary_name":"python3-bandit"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-114216.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_name":"bandit","binary_version":"1.7.10-3"},{"binary_version":"1.7.10-3","binary_name":"python3-bandit"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-114216.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:N/VI:L/VA:N/SC:L/SI:L/SA:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N"},{"type":"Ubun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