EUVD-2026-80315Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Unauthenticated remote crash (PR:N, A:H) but AC:H because the target route must use reply.trailer() over HTTP/2 (non-default); no confidentiality or integrity impact.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
Lifecycle Timeline
3DescriptionCVE.org
fastify is a fast and low-overhead web framework for Node.js. In versions before 5.12.5, when a route registers a response trailer via reply.trailer() and is served over HTTP/2, fastify unconditionally sets the Transfer-Encoding: chunked header, which is forbidden on HTTP/2, so Node.js throws while serializing the response headers. The exception is not caught and becomes an uncaughtException, so a single unauthenticated HTTP/2 request to any route that uses trailers crashes the server process and drops all in-flight requests, and it can be repeated on every restart. The issue is fixed in fastify 5.12.5, and users should upgrade to 5.12.5 or later. As a workaround, avoid registering response trailers with reply.trailer() on routes served over HTTP/2 until upgrading.
AnalysisAI
Unauthenticated HTTP/2 requests to Fastify routes that register response trailers crash the entire Node.js process, dropping all in-flight requests and repeating the outage on every restart. The flaw affects Fastify versions before 5.12.5 and requires two non-default, application-specific conditions: the server must have HTTP/2 enabled and at least one route must call reply.trailer(). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target Fastify application (before 5.12.5) to (1) serve traffic over HTTP/2 and (2) have at least one route that registers a response trailer via reply.trailer(). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but bounded availability risk, and notably the signals are self-consistent rather than inflated - a refreshing contrast to many CVSS-9.8 Node.js advisories. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Fastify to version 5.12.5 or later - the vendor-released patch that resolves this issue; the advisory is at https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-248 – Uncaught Exception
View allSame technique Denial Of Service
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External POC / Exploit Code
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