Improper Validation of Syntactic Correctness of Input Affecting bandit package, versions >=0.6.0 <1.13.0
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.
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Test your applications- Snyk IDSNYK-HEX-BANDIT-21184019
- published18 Oct 2026
- disclosed15 Oct 2026
- creditEurico Nicacio
Introduced: 15 Oct 2026
NewCVE-2026-105660 (opens in a new tab)How to fix?
Upgrade bandit to version 1.13.0 or higher.
Overview
bandit is a HTTP server for Plug and WebSock apps.
Affected versions of this package are vulnerable to Improper Validation of Syntactic Correctness of Input in the HTTP/1 request-line parser (do_read_headers in lib/bandit/http1/adapter.ex) when processing the request target. Prior to the fix, the parser only handled abs_path request targets and did not validate or reject other RFC 9112 request-target forms such as absoluteURI, authority-form, or *. An attacker can send a request with an unexpected request-target type, causing the server to misroute or misinterpret the request, resulting in unintended modification of server-side state.
Note: This is only exploitable for building absolute URLs unless the host has been checked against an allow-list.