Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-114216.html
- https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7
- https://github.com/mtrudel/bandit/commit/c31e9e3c76dcbfc239a96eabed5341ced7885ae
- https://github.com/mtrudel/bandit/security/advisories/GHSA-w5wc-g2hc-g7m2
- https://osv.dev/vulnerability/EEF-CVE-2026-114216
FAQ
What is CVE-2026-114216?
CVE-2026-114216 is a documented vulnerability. 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 smuggl...
How severe is CVE-2026-114216?
CVSS scoring is not yet available for CVE-2026-114216. Check NVD for updates.
Is there a patch for CVE-2026-114216?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.