HTTP Request Smuggling Affecting bandit package, versions >=0.6.4 <1.11.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-HEX-BANDIT-16346078
- published3 May 2026
- disclosed1 May 2026
- creditPJUllrich
Introduced: 1 May 2026
NewCVE-2026-39805 (opens in a new tab)How to fix?
Upgrade bandit to version 1.11.0 or higher.
Overview
bandit is a HTTP server for Plug and WebSock apps.
Affected versions of this package are vulnerable to HTTP Request Smuggling the get_content_length function in Bandit.Headers. An attacker can bypass content-length validation by sending multiple content-length headers, causing the server to accept an ambiguous request body length. This can lead to request desynchronization and incorrect request parsing, letting an attacker interfere with how downstream handlers process the request and potentially affect other users’ requests on the same connection.