Allocation of Resources Without Limits or Throttling Affecting bandit package, versions >=1.4.0 <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-16679449
- published14 May 2026
- disclosed13 May 2026
- creditPeter Ullrich
Introduced: 13 May 2026
CVE-2026-39803 (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 Allocation of Resources Without Limits or Throttling due to the read_data function in the HTTP/1 chunked body reader ignoring the configured length cap when processing chunked request bodies. An attacker can cause memory exhaustion and process termination by sending a single HTTP/1 POST request with Transfer-Encoding: chunked and an arbitrarily large body to any endpoint.