{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33805","assignerOrgId":"ce714d77-add3-4f53-aff5-83d477b104bb","state":"PUBLISHED","assignerShortName":"openjs","dateReserved":"2026-03-23T19:48:48.714Z","datePublished":"2026-04-15T10:13:25.147Z","dateUpdated":"2026-07-15T01:06:04.635Z"},"containers":{"cna":{"providerMetadata":{"orgId":"ce714d77-add3-4f53-aff5-83d477b104bb","shortName":"openjs","dateUpdated":"2026-04-15T10:13:25.147Z"},"descriptions":[{"lang":"en","value":"@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.","supportingMedia":[{"type":"text/html","base64":false,"value":"@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."}]}],"affected":[{"vendor":"@fastify/reply-from","product":"@fastify/reply-from","defaultStatus":"unaffected","versions":[{"versionType":"semver","status":"affected","version":"0","lessThan":"12.6.2"},{"versionType":"semver","status":"unaffected","version":"12.6.2"}],"packageURL":"pkg:npm/@fastify/reply-from"},{"vendor":"@fastify/reply-from","product":"@fastify/http-proxy","defaultStatus":"unaffected","versions":[{"versionType":"semver","status":"affected","version":"0","lessThan":"11.4.4"},{"versionType":"semver","status":"unaffected","version":"11.4.4"}],"packageURL":"pkg:npm/@fastify/http-proxy"}],"references":[{"url":"https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-gwhp-pf74-vj37"},{"url":"https://cna.openjsf.org/security-advisories.html"}],"credits":[{"lang":"en","type":"reporter","value":"FredKSchott"},{"lang":"en","type":"remediation developer","value":"mcollina"},{"lang":"en","type":"remediation reviewer","value":"UlisesGascon"},{"lang":"en","type":"remediation reviewer","value":"climba03003"}],"title":"@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers","metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","baseScore":9,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-644","lang":"en","description":"CWE-644: Improper Neutralization of HTTP Headers for Scripting Syntax","type":"CWE"}]}],"x_generator":{"engine":"cve-kit 1.0.0"}},"adp":[{"references":[{"url":"https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-gwhp-pf74-vj37","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-15T13:08:08.503908Z","id":"CVE-2026-33805","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-15T13:08:12.612Z"}},{"affected":[{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:openshift_devspaces:3.27::el9"],"defaultStatus":"affected","packageName":"devspaces/dashboard-rhel9","product":"Red Hat OpenShift Dev Spaces 3.27","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1776795511","versionType":"rpm"}]},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"unaffected","packageName":"rhoai/odh-dashboard-rhel8","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-dashboard-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-mod-arch-gen-ai-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-mod-arch-maas-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-mod-arch-model-registry-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"}],"datePublic":"2026-04-15T10:13:25.147Z","descriptions":[{"lang":"en","value":"A flaw was found in @fastify/reply-from and @fastify/http-proxy. A remote attacker can exploit this vulnerability by manipulating the Connection header in client requests. This allows the attacker to remove specific headers that the proxy has added for security, routing, or access control purposes. Consequently, an attacker could bypass security mechanisms or gain unauthorized access to resources."}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Important"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","description":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}]}],"references":[{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-33805"},{"name":"RHBZ#2458651","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458651"},{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33805.json"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:10175"}],"solutions":[{"lang":"en","value":"RHSA-2026:10175: Red Hat OpenShift Dev Spaces 3.27"}],"timeline":[{"lang":"en","time":"2026-04-15T11:00:57.611Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-04-15T10:13:25.147Z","value":"Made public."}],"title":"@fastify/reply-from: @fastify/http-proxy: Fastify Reply From and HTTP Proxy: Security bypass via Connection header manipulation","workarounds":[{"lang":"en","value":"Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}],"x_adpType":"supplier","x_generator":{"engine":"sadp-cli 1.0.0"},"providerMetadata":{"orgId":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","shortName":"redhat-SADP","dateUpdated":"2026-07-15T01:06:04.635Z"}}]}}