Description
Inconsistent Interpretation of HTTP Requests vulnerability in mtrudel bandit allows HTTP request smuggling via duplicate Content-Length headers. 'Elixir.Bandit.Headers':get_content_length/1 in lib/bandit/headers.ex uses List.keyfind/3, which returns only the first matching header. When a request contains two Content-Length headers with different values, Bandit silently accepts it, uses the first value to read the body, and dispatches the remaining bytes as a second pipelined request on the same keep-alive connection. RFC 9112 ยง6.3 requires recipients to treat this as an unrecoverable framing error. When Bandit sits behind a proxy that picks the last Content-Length value and forwards the request rather than rejecting it, an unauthenticated attacker can smuggle requests past edge WAF rules, path-based ACLs, rate limiting, and audit logging. This issue affects bandit: before 1.11.0.
INFO
Published Date :
2026-05-01T20:34:29.400Z
Last Modified :
2026-05-02T04:17:41.202Z
Source :
EEF
AFFECTED PRODUCTS
The following products are affected by CVE-2026-39805 vulnerability.
| Vendors | Products |
|---|---|
| Mtrudel |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-39805.
