Infinite loop Affecting bandit package, versions >=1.6.1 <1.11.1
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-16680210
- published14 May 2026
- disclosed13 May 2026
- creditPeter Ullrich
Introduced: 13 May 2026
NewCVE-2026-39806 (opens in a new tab)How to fix?
Upgrade bandit to version 1.11.1 or higher.
Overview
bandit is a HTTP server for Plug and WebSock apps.
Affected versions of this package are vulnerable to Infinite loop in the do_read_chunked_data! function. An attacker can cause the server to enter an infinite loop and exhaust worker processes by sending HTTP/1 chunked requests with trailer fields, leading to denial of service. This can be achieved by maintaining multiple concurrent connections with RFC-conformant chunked requests containing trailer fields, which prevents the worker process from terminating and renders the server unresponsive to further traffic.