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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
mtrudel bandit
Default version status: unaffected
1.12.4 to < 1.14.0affected
pkg:hex/banditmtrudel bandit
Default version status: unaffected
c31e9e3c76dcbfc239a96eabed5341ced7885ae5 to < 220b9dfd27f9a21305be2afc75cbe585ddc24e7aaffected
pkg:github/mtrudel/banditReferences
- https://github.com/mtrudel/bandit/security/advisories/GHSA-w5wc-g2hc-g7m2 ↗
- https://cna.erlef.org/cves/CVE-2026-114216.html ↗
- https://osv.dev/vulnerability/EEF-CVE-2026-114216 ↗
- https://github.com/mtrudel/bandit/commit/c31e9e3c76dcbfc239a96eabed5341ced7885ae5 ↗
- https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a ↗