{"id":"EUVD-2026-80315","enisaUuid":"8e60d8d9-8cf6-36ea-b28e-75e3bcbc03f0","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.","datePublished":"Sep 16, 2026, 8:52:49 AM","dateUpdated":"Sep 16, 2026, 2:00:59 PM","baseScore":5.9,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","references":"https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc\nhttps://cna.openjsf.org/security-advisories.html\n","aliases":"CVE-2026-92081\nGHSA-4mh8-r7rc-xpvc\n","assigner":"openjs","epss":0.41,"enisaIdProduct":[{"id":"0fc0d233-e3e9-3fc6-a38a-03767ea39a04","product":{"name":"fastify","vendor":{"name":"@clerk"}},"product_version":"0 \u003c5.12.5"}],"enisaIdVendor":[{"id":"82c8bcf1-79d0-379b-ab4b-fcd67eb4e4ca","vendor":{"name":"fastify"}}],"enisaIdVulnerability":[{"id":"0f1956ac-8ffe-37d5-a711-91b6f775196a","vulnerability":{"id":"GHSA-4mh8-r7rc-xpvc","description":"fastify vulnerable to Denial of Service via unhandled exception on HTTP/2 trailer responses","datePublished":"Sep 30, 2026, 11:53:44 PM","dateUpdated":"Sep 30, 2026, 11:53:44 PM","baseScore":0.0,"references":"https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-92081\nhttps://github.com/fastify/fastify/issues/6574\nhttps://github.com/fastify/fastify/commit/ad06a4c3fe8a944a904f38068249b18b8f552e90\nhttps://cna.openjsf.org/security-advisories.html\nhttps://github.com/fastify/fastify\nhttps://github.com/fastify/fastify/releases/tag/v5.12.5\n","enisa_id":"EUVD-2026-80315\n","aliases":"CVE-2026-92081\nGHSA-4mh8-r7rc-xpvc\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:07:07 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"89231c6f-8545-38cf-9f09-3150a88ac585","vulnerability":{"id":"CVE-2026-92081","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.","datePublished":"Sep 16, 2026, 8:52:49 AM","dateUpdated":"Sep 16, 2026, 2:00:59 PM","status":"PUBLISHED","baseScore":5.9,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","references":"https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc\nhttps://cna.openjsf.org/security-advisories.html\n","enisa_id":"EUVD-2026-80315\n","assigner":"openjs","epss":0.41,"dataProcessed":"Nov 5, 2026, 7:17:30 AM","vulnerabilityProduct":[{"id":"ff40303e-75d5-3be1-a76d-4908bc24d2ea","product":{"name":"fastify","vendor":{"name":"@clerk"}},"product_version":"0 \u003c5.12.5"}],"vulnerabilityVendor":[{"id":"9e7b762f-ad3d-3630-b437-ddccbd0bfd5e","vendor":{"name":"fastify"}}]}}],"enisaIdAdvisory":[]}