{"id":"CVE-2026-92081","revision":null,"records":[{"revision":"d8444d2507744b01b738484f651ca343","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-92081","aliases":[],"title":"fastify vulnerable to Denial of Service via unhandled exception on HTTP/2 trailer responses","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.","state":0,"publishedAt":"2026-09-16T08:52:49.757+00:00","modifiedAt":"2026-09-16T14:00:59.305+00:00","affected":[{"ecosystem":"Vendor product","name":"fastify","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fastify\",\n                    \"product\": \"fastify\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.12.5\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"unaffected\",\n                            \"version\": \"5.12.5\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:npm/fastify\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-92081","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-92081","identifiers":["CVE-2026-92081"]},"retained":false,"historicalAffected":[]},{"revision":"3aec139a7134483099d525a8e4784bcc","observedAt":"2026-11-11T18:10:37.159+00:00","statement":{"source":"euvd","id":"EUVD-2026-80315","aliases":["CVE-2026-92081","GHSA-4mh8-r7rc-xpvc"],"title":"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 he…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":null}],"references":["https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-80315","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 16, 2026, 8:52:49 AM","dateUpdated":"Sep 16, 2026, 2:00:59 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-80315","identifiers":["EUVD-2026-80315","CVE-2026-92081","GHSA-4mh8-r7rc-xpvc"]},"retained":false,"historicalAffected":[]},{"revision":"51b8fd068ce1496bb9dc7875bf02d44f","observedAt":"2026-10-25T16:19:22.228+00:00","statement":{"source":"nvd","id":"CVE-2026-92081","aliases":[],"title":"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 he…","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.","state":0,"publishedAt":"2026-09-16T09:17:10.137+00:00","modifiedAt":"2026-09-16T19:40:00.317+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"}],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92081","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-248"],"productCriteria":[],"sourceDates":{"published":"2026-09-16T09:17:10.137","lastModified":"2026-09-16T19:40:00.317"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-92081","identifiers":["CVE-2026-92081"]},"retained":false,"historicalAffected":[]},{"revision":"484014ac1cad419fa59506e92d40f760","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-4mh8-r7rc-xpvc","aliases":["CVE-2026-92081"],"title":"fastify vulnerable to Denial of Service via unhandled exception on HTTP/2 trailer responses","description":"### Impact\n\n`fastify` crashes with an uncaught `ERR_HTTP2_INVALID_CONNECTION_HEADERS` exception when a route that registers a response trailer via `reply.trailer()` is served over HTTP/2. Fastify unconditionally adds the `Transfer-Encoding: chunked` header when a trailer is set, which is forbidden on HTTP/2, so Node.js throws while serializing the response headers. The exception is not caught and becomes an uncaughtException, terminating the Node.js process.\n\nOne unauthenticated HTTP/2 request to any route that uses trailers is enough to crash the server, dropping all in-flight requests, and the request can be repeated to keep the process down. Applications are affected only when HTTP/2 is enabled (`http2: true`) and at least one route registers a trailer. HTTP/1.x responses are not affected.\n\n### Patches\n\nUpgrade to `fastify` `5.12.5` or later.\n\n### Workarounds\n\nAvoid registering response trailers with `reply.trailer()` on routes served over HTTP/2 until upgrading.","state":0,"publishedAt":"2026-09-30T23:53:44+00:00","modifiedAt":"2026-10-01T00:00:05.7783717+00:00","affected":[{"ecosystem":"npm","name":"fastify","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"5.12.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc","https://nvd.nist.gov/vuln/detail/CVE-2026-92081","https://github.com/fastify/fastify/issues/6574","https://github.com/fastify/fastify/commit/ad06a4c3fe8a944a904f38068249b18b8f552e90","https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fastify","https://github.com/fastify/fastify/releases/tag/v5.12.5"],"sourceUrl":"https://github.com/advisories/GHSA-4mh8-r7rc-xpvc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4mh8-r7rc-xpvc","identifiers":["GHSA-4mh8-r7rc-xpvc","CVE-2026-92081"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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