{"id":"CVE-2026-114216","summary":"Chunk extensions accept bare LF and CR, enabling request smuggling in Bandit","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.\n\nThe 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.\n\nThis issue affects bandit: from 1.12.4 before 1.14.0.","aliases":["EEF-CVE-2026-114216","GHSA-w5wc-g2hc-g7m2"],"modified":"2026-10-28T02:52:21.057969477Z","published":"2026-10-26T13:30:41.225Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114216.json","cna_assigner":"EEF","cwe_ids":["CWE-444"]},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-114216.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-114216"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114216.json"},{"type":"ADVISORY","url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-w5wc-g2hc-g7m2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114216"},{"type":"FIX","url":"https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"type":"FIX","url":"https://github.com/mtrudel/bandit/commit/c31e9e3c76dcbfc239a96eabed5341ced7885ae5"},{"type":"PACKAGE","url":"https://github.com/mtrudel/bandit"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mtrudel/bandit","events":[{"introduced":"c31e9e3c76dcbfc239a96eabed5341ced7885ae5"},{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"introduced":"00d532fa0618d969cdb97590116175836a357a87"},{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"fixed":"c31e9e3c76dcbfc239a96eabed5341ced7885ae5"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"c31e9e3c76dcbfc239a96eabed5341ced7885ae5"},{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"}],"source":"AFFECTED_FIELD"},{"strategy":"StandardRange","range":[{"introduced":"1.12.4"},{"fixed":"1.14.0"}],"source":"AFFECTED_FIELD"},{"range":[{"fixed":"c31e9e3c76dcbfc239a96eabed5341ced7885ae5"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"}]}]}}],"versions":["1.13.1","1.13.0","1.12.5","1.12.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}