{"id":"CVE-2026-33805","revision":"b72986e1f38a4f40b2d8897602a973d0","records":[{"revision":"b72986e1f38a4f40b2d8897602a973d0","observedAt":"2026-10-25T08:17:24.447+00:00","statement":{"source":"nvd","id":"CVE-2026-33805","aliases":[],"title":"@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip pro…","description":"@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from. \n\nUpgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.","state":0,"publishedAt":"2026-04-15T11:16:34.99+00:00","modifiedAt":"2026-07-15T02:20:15.547+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":9,"severity":"CRITICAL"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","score":8.6,"severity":"HIGH"},{"system":"CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4,"severity":"HIGH"}],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-gwhp-pf74-vj37","https://access.redhat.com/errata/RHSA-2026:10175","https://access.redhat.com/security/cve/CVE-2026-33805","https://bugzilla.redhat.com/show_bug.cgi?id=2458651","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33805.json"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-33805","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-644","CWE-444"],"productCriteria":["cpe:2.3:a:fastify:fastify\\/http-proxy:*:*:*:*:*:node.js:*:*","cpe:2.3:a:fastify:reply-from:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-04-15T11:16:34.990","lastModified":"2026-07-15T02:20:15.547"},"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-2026-33805","identifiers":["CVE-2026-33805"]},"retained":false,"historicalAffected":[]}],"coverage":[]}