Uncaught Exception Affecting granian package, versions [,2.7.4)
Threat Intelligence
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-PYTHON-GRANIAN-16635313
- published11 May 2026
- disclosed6 May 2026
- creditReporter
Introduced: 6 May 2026
CVE-2026-42544 (opens in a new tab)How to fix?
Upgrade granian to version 2.7.4 or higher.
Overview
granian is an A Rust HTTP server for Python applications
Affected versions of this package are vulnerable to Uncaught Exception via the Sec-WebSocket-Protocol header processing in the WebSocket upgrade request path. An attacker can cause a worker process to terminate unexpectedly by sending a specially crafted WebSocket upgrade request containing non-ASCII bytes in the Sec-WebSocket-Protocol header. This can be repeated across multiple workers to take the service offline. This is only exploitable if the server is running with the default panic behavior that aborts the worker process.