Uncaught Exception Affecting fastify package, versions <5.12.5
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-JS-FASTIFY-19883909
- published17 Sept 2026
- disclosed16 Sept 2026
- creditzerovulnlabs
Introduced: 16 Sep 2026
NewCVE-2026-92081 (opens in a new tab)How to fix?
Upgrade fastify to version 5.12.5 or higher.
Overview
fastify is an overhead web framework, for Node.js.
Affected versions of this package are vulnerable to Uncaught Exception via the reply.trailer function when handling HTTP/2 trailer responses. An attacker can cause the server process to crash and terminate all active requests by sending a single unauthenticated HTTP/2 request to any route that registers a response trailer. This can be repeated after each restart to continually disrupt service.
Workaround
This vulnerability can be mitigated by avoiding the registration of response trailers with reply.trailer on routes served over HTTP/2 until upgrading.