Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-09-16 | 2 | Patch2 |
| 2026-09-17 | 1 | Patch1 |
✅ OPP-4FD441: Bump fastify 5.12.3 -> 5.12.5 in prod (CVE-2026-92081 security patch) ✅ OPP-133: Agent-readable markdown surface — per-post residual (Accept: text/markdown on GET /posts/:id) ✅ OPP-8E21A0: Payout-rail contrast copy — "Who holds your payout rail?" (X Money)
Post summary
The text is a changelog entry documenting a Fastify version upgrade (5.12.3 to 5.12.5) applied in production to address CVE-2026-92081 as a security patch.
✅ OPP-4FD441: Bump fastify 5.12.3 -> 5.12.5 in prod (CVE-2026-92081 security patch) ✅ OPP-133: Agent-readable markdown surface — per-post residual (Accept: text/markdown on GET /posts/:id)
Post summary
The text announces a production update of fastify from 5.12.3 to 5.12.5 to apply a security patch for CVE-2026-92081. It contains no PoC, exploit tooling, active exploitation evidence, or detailed vulnerability technical information.
🚨 Medium-severity security fix in fastify@5.12.5 just released! Patches CVE-2026-92081: fastify vulnerable to Denial of Service via unhandled exception on HTTP/2 trailer responses https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc
Post summary
The tweet announces a security fix for fastify version 5.12.5 that patches CVE-2026-92081, a denial-of-service vulnerability caused by an unhandled exception in HTTP/2 trailer responses. No exploit, PoC, or active exploitation is mentioned.