{"id":"GO-2026-6441","revision":null,"records":[{"revision":"9446e12d18c04d6abe8178d9fb1fe87a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-84303","aliases":[],"title":"gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion","description":"gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, the xDS RBAC HTTP filter in internal/xds/httpfilter/rbac/rbac.go does not lowercase header matcher names in normalizeHeaderMatcher even though incoming metadata keys are lowercase. A DENY policy using a mixed-case name such as X-Role or User-Agent therefore does not match and fails open, allowing requests that should be rejected. The same case mismatch permits :Scheme or Grpc-Status to evade gRFC A41 validation and prevents Host from being rewritten to :authority. This issue is fixed in version 1.83.1.","state":0,"publishedAt":"2026-09-01T18:14:37.87+00:00","modifiedAt":"2026-09-02T19:14:49.353+00:00","affected":[{"ecosystem":"Vendor product","name":"grpc-go","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"grpc\",\n                    \"product\": \"grpc-go\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.83.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"}],"references":["https://github.com/grpc/grpc-go/security/advisories/GHSA-qc2q-p7wx-3px3","https://github.com/grpc/grpc-go/pull/9332","https://github.com/grpc/grpc-go/pull/9335","https://github.com/grpc/grpc-go/commit/db9482836c298f234c896cf82ab68cafc78237f8","https://github.com/grpc/grpc-go/commit/ebba6f3f1b206e2b4dc4d1d5a96d18430302c2fe","https://github.com/grpc/grpc-go/releases/tag/v1.83.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-84303","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-84303","identifiers":["CVE-2026-84303"]},"retained":false,"historicalAffected":[]},{"revision":"75759f8244e04d8ca63021af277ed8e9","observedAt":"2026-11-11T17:00:50.763+00:00","statement":{"source":"euvd","id":"EUVD-2026-69419","aliases":["CVE-2026-84303","GHSA-qc2q-p7wx-3px3"],"title":"gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, the xDS RBAC HTTP filter in internal/xds/httpfilter/rbac/rbac.go does not lowercase header matcher names in normalizeHeaderMatcher even though incoming metadata keys are lo…","description":"gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, the xDS RBAC HTTP filter in internal/xds/httpfilter/rbac/rbac.go does not lowercase header matcher names in normalizeHeaderMatcher even though incoming metadata keys are lowercase. A DENY policy using a mixed-case name such as X-Role or User-Agent therefore does not match and fails open, allowing requests that should be rejected. The same case mismatch permits :Scheme or Grpc-Status to evade gRFC A41 validation and prevents Host from being rewritten to :authority. This issue is fixed in version 1.83.1.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":null}],"references":["https://github.com/grpc/grpc-go/security/advisories/GHSA-qc2q-p7wx-3px3","https://github.com/grpc/grpc-go/pull/9332","https://github.com/grpc/grpc-go/pull/9335","https://github.com/grpc/grpc-go/commit/db9482836c298f234c896cf82ab68cafc78237f8","https://github.com/grpc/grpc-go/commit/ebba6f3f1b206e2b4dc4d1d5a96d18430302c2fe","https://github.com/grpc/grpc-go/releases/tag/v1.83.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-69419","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 1, 2026, 6:14:37 PM","dateUpdated":"Sep 2, 2026, 7:14:49 PM"},"relatedAdvisories":[{"id":"openSUSE-SU-2026:22134-1","title":"Security update for gh","vulnerabilityIds":["CVE-2026-41178","CVE-2026-59831","CVE-2026-63209","CVE-2026-72924","CVE-2026-78669","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:22035-1","title":"Security update for amazon-ecs-init","vulnerabilityIds":["CVE-2026-41178","CVE-2026-84303","CVE-2026-84304"]},{"id":"openSUSE-SU-2026:11752-1","title":"kubevirt1.9-container-disk-1.9.0-3.1 on GA media","vulnerabilityIds":["CVE-2026-13622","CVE-2026-56854","CVE-2026-56855","CVE-2026-84303","CVE-2026-84304"]},{"id":"openSUSE-SU-2026:21824-1","title":"Security update for 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google-guest-agent","vulnerabilityIds":["CVE-2026-33186","CVE-2026-56852","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:21927-1","title":"Security update for apptainer","vulnerabilityIds":["CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23736-1","title":"Security update for google-guest-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:21834-1","title":"Security update for google-cloud-sap-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23852-1","title":"Security update for 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helm","vulnerabilityIds":["CVE-2026-37236","CVE-2026-41178","CVE-2026-48978","CVE-2026-50151","CVE-2026-63308","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23730-1","title":"Security update for helm","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11695-1","title":"cadvisor-0.60.5-3.1 on GA media","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23546-1","title":"Security update for helm","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23831-1","title":"Security update for google-guest-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11920-1","title":"grafana-12.4.11-1.1 on GA media","vulnerabilityIds":["CVE-2026-15815","CVE-2026-56855","CVE-2026-76154","CVE-2026-79656","CVE-2026-83530","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11830-1","title":"apptainer-1.5.3-4.1 on GA media","vulnerabilityIds":["CVE-2026-56854","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:22224-1","title":"Security update for rqlite","vulnerabilityIds":["CVE-2026-39821","CVE-2026-63209","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445","CVE-2026-89090"]},{"id":"openSUSE-SU-2026:12241-1","title":"kubevirt1.8-container-disk-1.8.4-7.1 on GA media","vulnerabilityIds":["CVE-2026-56854","CVE-2026-78659","CVE-2026-78660","CVE-2026-78662","CVE-2026-78669","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:21882-1","title":"Security update for google-osconfig-agent","vulnerabilityIds":["CVE-2026-41178","CVE-2026-56852","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23739-1","title":"Security update for google-osconfig-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:4292-1","title":"Security update for google-osconfig-agent","vulnerabilityIds":["CVE-2026-41178","CVE-2026-56852","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23548-1","title":"Security update for google-osconfig-agent","vulnerabilityIds":["CVE-2026-39821","CVE-2026-56852","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:21801-1","title":"Security update for trivy","vulnerabilityIds":["CVE-2026-24122","CVE-2026-37236","CVE-2026-41178","CVE-2026-50163","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:24150-1","title":"Security update for amazon-ecs-init","vulnerabilityIds":["CVE-2026-41178","CVE-2026-84303","CVE-2026-84304"]},{"id":"openSUSE-SU-2026:21841-1","title":"Security update for hauler","vulnerabilityIds":["CVE-2026-41888","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11732-1","title":"containerized-data-importer1.66-api-1.66.1-1.1 on GA media","vulnerabilityIds":["CVE-2026-41178","CVE-2026-56854","CVE-2026-56855","CVE-2026-84303","CVE-2026-84304"]},{"id":"SUSE-SU-2026:23864-1","title":"Security update for distribution","vulnerabilityIds":["CVE-2026-37236","CVE-2026-39827","CVE-2026-41178","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23708-1","title":"Security update for google-cloud-sap-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:21843-1","title":"Security update for cadvisor","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:23729-1","title":"Security update for google-cloud-sap-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11686-1","title":"helm3-3.21.3-8.1 on GA media","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11713-1","title":"trivy-0.74.0-4.1 on GA media","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:21898-1","title":"Security update for distribution","vulnerabilityIds":["CVE-2026-37236","CVE-2026-39827","CVE-2026-41178","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11837-1","title":"mcphost-0.34.0-11.1 on GA media","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:21879-1","title":"Security update for google-guest-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:4178-1","title":"Security update for google-cloud-sap-agent","vulnerabilityIds":["CVE-2026-56852","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11853-1","title":"golang-github-v2fly-v2ray-core-5.54.2-1.1 on GA media","vulnerabilityIds":["CVE-2026-84303"]},{"id":"openSUSE-SU-2026:21996-1","title":"Security update for v2ray-core","vulnerabilityIds":["CVE-2026-39821","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:22221-1","title":"Security update for warewulf4","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11700-1","title":"hauler-2.1.0-3.1 on GA media","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"SUSE-SU-2026:4308-1","title":"Security update for apptainer","vulnerabilityIds":["CVE-2026-56854","CVE-2026-56855","CVE-2026-78662","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11697-1","title":"distribution-registry-3.1.1-6.1 on GA media","vulnerabilityIds":["CVE-2026-37236","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11718-1","title":"helm-4.2.4-3.1 on GA media","vulnerabilityIds":["CVE-2026-37236","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"msrc_CVE-2026-84303","title":"gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion","vulnerabilityIds":["CVE-2026-84303"]},{"id":"openSUSE-SU-2026:12114-1","title":"alloy-1.20.1-1.1 on GA media","vulnerabilityIds":["CVE-2026-14362","CVE-2026-63209","CVE-2026-81871","CVE-2026-81872","CVE-2026-84303","CVE-2026-84304","CVE-2026-84445"]},{"id":"openSUSE-SU-2026:11743-1","title":"google-osconfig-agent-20260908.00-1.1 on GA media","vulnerabilityIds":["CVE-2026-84303","CVE-2026-84445"]}],"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-2026-69419","identifiers":["EUVD-2026-69419","CVE-2026-84303","GHSA-qc2q-p7wx-3px3"]},"retained":false,"historicalAffected":[]},{"revision":"706d75424eaa4a05969a67d09b35f9f7","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-84303","aliases":[],"title":"gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, the xDS RBAC HTTP filter in internal/xds/httpfilter/rbac/rbac.go does not lowercase header matcher names in normalizeHeaderMatcher even though incoming metadata keys are lo…","description":"gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, the xDS RBAC HTTP filter in internal/xds/httpfilter/rbac/rbac.go does not lowercase header matcher names in normalizeHeaderMatcher even though incoming metadata keys are lowercase. A DENY policy using a mixed-case name such as X-Role or User-Agent therefore does not match and fails open, allowing requests that should be rejected. The same case mismatch permits :Scheme or Grpc-Status to evade gRFC A41 validation and prevents Host from being rewritten to :authority. This issue is fixed in version 1.83.1.","state":0,"publishedAt":"2026-09-01T19:17:30.6+00:00","modifiedAt":"2026-09-09T21:09:13.08+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/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":6.3,"severity":"MEDIUM"}],"references":["https://github.com/grpc/grpc-go/commit/db9482836c298f234c896cf82ab68cafc78237f8","https://github.com/grpc/grpc-go/commit/ebba6f3f1b206e2b4dc4d1d5a96d18430302c2fe","https://github.com/grpc/grpc-go/pull/9332","https://github.com/grpc/grpc-go/pull/9335","https://github.com/grpc/grpc-go/releases/tag/v1.83.1","https://github.com/grpc/grpc-go/security/advisories/GHSA-qc2q-p7wx-3px3"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84303","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-178","CWE-863"],"productCriteria":[],"sourceDates":{"published":"2026-09-01T19:17:30.600","lastModified":"2026-09-09T21:09:13.080"},"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-2026-84303","identifiers":["CVE-2026-84303"]},"retained":false,"historicalAffected":[]},{"revision":"03c7d3bc35ff4503a43ab406ea0e653e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-qc2q-p7wx-3px3","aliases":["CVE-2026-84303","GO-2026-6441"],"title":"gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion","description":"### Summary\nA vulnerability in the xDS RBAC HTTP filter implementation in grpc-go allows remote attackers to bypass authorization policies (specifically DENY rules) by using mixed-case or canonical-case header matchers (e.g., X-Role instead of x-role). Additionally, the safety guards introduced by gRFC A41 to block grpc- prefixed headers can be evaded via variations in casing (e.g., Grpc-Status).\n\n### Impact\nWhen an operator defines an RBAC policy referencing headers containing uppercase letters (e.g. X-Role), grpc-go fails to match incoming metadata keys because they are unconditionally lowercased. Because of this case-sensitivity mismatch, a policy designed to block requests containing specific header values fails open: the rule is evaluated as a non-match, and traffic that should have been rejected is served.\n\nFurthermore, gRFC A41 requires rejecting configuration schemas specifying header matchers starting with grpc-. Because this check is executed case-sensitively in grpc-go, attackers can bypass the validation by specifying titles like Grpc-Status.\n\n### Patches\nThe problem is fixed in `master` and in the 1.83.1 release.","state":0,"publishedAt":"2026-09-08T20:50:21+00:00","modifiedAt":"2026-09-15T19:10:32.5584195+00:00","affected":[{"ecosystem":"Go","name":"google.golang.org/grpc","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.83.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/grpc/grpc-go/security/advisories/GHSA-qc2q-p7wx-3px3","https://nvd.nist.gov/vuln/detail/CVE-2026-84303","https://github.com/grpc/grpc-go/pull/9332","https://github.com/grpc/grpc-go/pull/9335","https://github.com/grpc/grpc-go/commit/db9482836c298f234c896cf82ab68cafc78237f8","https://github.com/grpc/grpc-go/commit/ebba6f3f1b206e2b4dc4d1d5a96d18430302c2fe","https://github.com/grpc/grpc-go","https://github.com/grpc/grpc-go/releases/tag/v1.83.1"],"sourceUrl":"https://github.com/advisories/GHSA-qc2q-p7wx-3px3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-qc2q-p7wx-3px3","identifiers":["GHSA-qc2q-p7wx-3px3","CVE-2026-84303","GO-2026-6441"]},"retained":false,"historicalAffected":[]},{"revision":"742d66a927084cd9a21c01bad28a34b9","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6441","aliases":["CVE-2026-84303","GHSA-qc2q-p7wx-3px3"],"title":"Bypass of xDS RBAC HTTP filter header matching in google.golang.org/grpc","description":"In google.golang.org/grpc, the xDS RBAC HTTP filter does not lowercase header matcher names before evaluating them against incoming request metadata. When an RBAC policy defines rules (such as DENY) referencing headers with uppercase or mixed-case characters, the rule fails to match, causing authorization policies to fail open. Additionally, callers can evade gRFC A41 validation blocking \"grpc-\" prefixed headers and \":scheme\" via variations in casing.","state":0,"publishedAt":"2026-09-15T18:39:25+00:00","modifiedAt":"2026-09-15T19:00:17.1305759+00:00","affected":[{"ecosystem":"Go","name":"google.golang.org/grpc","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.83.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/grpc/grpc-go/security/advisories/GHSA-qc2q-p7wx-3px3","https://github.com/grpc/grpc-go/pull/9332"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6441","license":"OSV · upstream source license applies","key":"osv:GO-2026-6441","identifiers":["GO-2026-6441","CVE-2026-84303","GHSA-qc2q-p7wx-3px3"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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