Medium
golang-google-grpc, google-guest-agent and 1 more products — security advisory
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.
- Products
- golang-google-grpc, google-guest-agent, grpc
- Affected versions
- 0.0~git20150514.0.f5ebd86-1, 0.0~git20150514.0.f5ebd86-2, 0.0~git20151002.0.3e7b7e5-1, 0.10.2-1, 0.11.1-1, 1.0.4-1, 1.16.1-1, 1.16.1-1ubuntu1, 1.16.1-1ubuntu3, 1.16.1-1ubuntu4, 1.16.1-1ubuntu5, 1.22.1-1ubuntu1, 1.29.1-0ubuntu1, 1.3.2-1, 1.3.2-1.1~build1, 1.3.2-1ubuntu1, 1.30.2-3, 1.30.2-3build1, 1.30.2-3build3, 1.30.2-3build5, 1.30.2-3build6, 1.38.0+really1.33.3-1build1, 1.38.0+really1.33.3-1ubuntu0.24.04.1, 1.38.0+really1.33.3-1ubuntu0.24.04.2, 1.38.0+really1.33.3-1ubuntu0.24.04.2+esm1, 1.38.0+really1.33.3-1ubuntu0.24.04.3, 1.38.0+really1.33.3-1ubuntu0.24.04.3+esm1, 1.38.0+really1.33.3-1ubuntu0.24.04.3+esm2, 1.51.1-10ubuntu1, 1.51.1-3build3, 1.51.1-3build4, 1.51.1-4, 1.51.1-4.1build3, 1.51.1-4.1build4, 1.51.1-4.1build5, 1.51.1-4build1, 1.51.1-4build2, 1.51.1-6build1, 1.51.1-7, 1.51.1-7ubuntu2, 1.51.1-7ubuntu3, 1.51.1-8ubuntu1, 1.51.1-9, 1.51.1-9ubuntu3, 1.6.0-2, 1.6.0-3, 1.6.0-3ubuntu0.18.04.1, 1.64.0-7, 1.66.3-2, 1.81.1-1build1, 20201217.02-0ubuntu1~16.04.0, 20201217.02-0ubuntu1~18.04.0, 20201217.02-0ubuntu1~20.04.0, 20210414.00-0ubuntu1~18.04.0, 20210414.00-0ubuntu1~20.04.0, 20210629.00-0ubuntu1, 20210629.00-0ubuntu1~18.04.1, 20210629.00-0ubuntu1~20.04.0, 20210629.00-0ubuntu2, 20220104.00-0ubuntu1, 20220104.00-0ubuntu2, 20220622.00-0ubuntu2~18.04.0, 20220622.00-0ubuntu2~18.04.1, 20220622.00-0ubuntu2~20.04.0, 20220622.00-0ubuntu2~20.04.2, 20220622.00-0ubuntu2~22.04.0, 20220622.00-0ubuntu2~22.04.1, 20230426.00-0ubuntu2~16.04.3, 20230426.00-0ubuntu2~18.04.0, 20230426.00-0ubuntu2~20.04.0, 20230426.00-0ubuntu2~22.04.0, 20230426.00-0ubuntu3, 20231004.02-0ubuntu1, 20231004.02-0ubuntu1~16.04.1, 20231004.02-0ubuntu1~16.04.2, 20231004.02-0ubuntu1~18.04.2, 20231004.02-0ubuntu1~18.04.3, 20231004.02-0ubuntu1~20.04.1, 20231004.02-0ubuntu1~20.04.2, 20231004.02-0ubuntu1~20.04.3, 20231004.02-0ubuntu1~20.04.4, 20231004.02-0ubuntu1~22.04.1, 20231004.02-0ubuntu1~22.04.2, 20231004.02-0ubuntu1~22.04.3, 20231004.02-0ubuntu1~22.04.4, 20231004.02-0ubuntu1~22.04.5, 20231004.02-0ubuntu3, 20240213.00-0ubuntu1, 20240213.00-0ubuntu2, 20240213.00-0ubuntu3, 20240213.00-0ubuntu3.1, 20240213.00-0ubuntu3.2, 20240716.00-0ubuntu1~16.04.0, 20240716.00-0ubuntu1~16.04.0+esm1, 20240716.00-0ubuntu1~16.04.0+esm2, 20240716.00-0ubuntu1~16.04.0+esm3, 20240716.00-0ubuntu1~18.04.0, 20240716.00-0ubuntu1~20.04.0, 20240716.00-0ubuntu1~22.04.0, 20240716.00-0ubuntu1~24.04.0, 20240716.00-0ubuntu1~24.04.1, 20241011.01-0ubuntu1~18.04.0, 20241011.01-0ubuntu1~18.04.0+esm1, 20241011.01-0ubuntu1~18.04.0+esm2, 20241011.01-0ubuntu1~18.04.0+esm3, 20241011.01-0ubuntu1~20.04.1, 20241011.01-0ubuntu1~22.04.0, 20241011.01-0ubuntu1~24.04.0, 20250116.00-0ubuntu1~20.04.0, 20250116.00-0ubuntu1~20.04.0+esm1, 20250116.00-0ubuntu1~20.04.0+esm2, 20250116.00-0ubuntu1~20.04.0+esm3, 20250116.00-0ubuntu1~22.04.0, 20250116.00-0ubuntu1~22.04.1, 20250116.00-0ubuntu1~22.04.2, 20250116.00-0ubuntu1~22.04.3, 20250116.00-0ubuntu1~22.04.4, 20250116.00-0ubuntu1~24.04.0, 20250116.00-0ubuntu1~24.04.1, 20250116.00-0ubuntu1~24.04.2, 20250116.00-0ubuntu1~24.04.3, 20250116.00-0ubuntu1~24.04.4, 20250506.01-0ubuntu1, 20250506.01-0ubuntu2, 20250506.01-0ubuntu2.1, 20250506.01-0ubuntu3, 20260819.00+~20260819.00-0ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-84303
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:23 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-84303
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
grpc
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
grpc
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
grpc
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
grpc
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
grpc
Fixed versions: Not specified
Complete source record
{
"id": "1d6cb1230cef535ccc726c99ad8cf011ddf00e96804b1ad6d3ff788ecd1f5ca2",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-84303",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-84303",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-84303",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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{
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{
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{
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{
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{
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}
]
},
{
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{
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},
{
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"evidence": "/affected/3/versions"
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{
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{
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]
},
{
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{
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{
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{
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"evidence": "/affected/4/versions"
},
{
"value": "20220622.00-0ubuntu2~18.04.0",
"evidence": "/affected/4/versions"
},
{
"value": "20220622.00-0ubuntu2~18.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "20230426.00-0ubuntu2~18.04.0",
"evidence": "/affected/4/versions"
},
{
"value": "20231004.02-0ubuntu1~18.04.2",
"evidence": "/affected/4/versions"
},
{
"value": "20231004.02-0ubuntu1~18.04.3",
"evidence": "/affected/4/versions"
},
{
"value": "20240716.00-0ubuntu1~18.04.0",
"evidence": "/affected/4/versions"
},
{
"value": "20241011.01-0ubuntu1~18.04.0",
"evidence": "/affected/4/versions"
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{
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},
{
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"evidence": "/affected/4/versions"
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{
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}
]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/5/versions"
},
{
"value": "1.3.2-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1.3.2-1.1~build1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "google-guest-agent",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "20201217.02-0ubuntu1~20.04.0",
"evidence": "/affected/6/versions"
},
{
"value": "20210414.00-0ubuntu1~20.04.0",
"evidence": "/affected/6/versions"
},
{
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"evidence": "/affected/6/versions"
},
{
"value": "20220622.00-0ubuntu2~20.04.0",
"evidence": "/affected/6/versions"
},
{
"value": "20220622.00-0ubuntu2~20.04.2",
"evidence": "/affected/6/versions"
},
{
"value": "20230426.00-0ubuntu2~20.04.0",
"evidence": "/affected/6/versions"
},
{
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{
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{
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{
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{
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},
{
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"evidence": "/affected/6/versions"
},
{
"value": "20250116.00-0ubuntu1~20.04.0+esm2",
"evidence": "/affected/6/versions"
},
{
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"evidence": "/affected/6/versions"
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]
},
{
"name": {
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"evidence": "/affected/7/package/name"
},
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"affected_versions": [
{
"value": "1.22.1-1ubuntu1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
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"evidence": "/affected/8/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/8/versions"
},
{
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"evidence": "/affected/8/versions"
},
{
"value": "1.16.1-1ubuntu3",
"evidence": "/affected/8/versions"
},
{
"value": "1.16.1-1ubuntu4",
"evidence": "/affected/8/versions"
},
{
"value": "1.16.1-1ubuntu5",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
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"evidence": "/affected/9/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/9/versions"
}
]
},
{
"name": {
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"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
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{
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{
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"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
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{
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"evidence": "/affected/10/versions"
},
{
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{
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{
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{
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{
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{
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{
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{
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},
{
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},
{
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"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
},
{
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}
]
},
{
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},
"prerequisites": [],
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"affected_versions": [
{
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{
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{
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{
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{
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]
},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
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{
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},
{
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"evidence": "/affected/12/versions"
},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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"evidence": "/affected/12/versions"
},
{
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"evidence": "/affected/12/versions"
},
{
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"evidence": "/affected/12/versions"
},
{
"value": "20250116.00-0ubuntu1~24.04.3",
"evidence": "/affected/12/versions"
},
{
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"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "grpc",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.51.1-3build3",
"evidence": "/affected/13/versions"
},
{
"value": "1.51.1-3build4",
"evidence": "/affected/13/versions"
},
{
"value": "1.51.1-4",
"evidence": "/affected/13/versions"
},
{
"value": "1.51.1-4build1",
"evidence": "/affected/13/versions"
},
{
"value": "1.51.1-4build2",
"evidence": "/affected/13/versions"
},
{
"value": "1.51.1-4.1build3",
"evidence": "/affected/13/versions"
},
{
"value": "1.51.1-4.1build4",
"evidence": "/affected/13/versions"
},
{
"value": "1.51.1-4.1build5",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "golang-google-grpc",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.38.0+really1.33.3-1build1",
"evidence": "/affected/14/versions"
},
{
"value": "1.38.0+really1.33.3-1ubuntu0.24.04.1",
"evidence": "/affected/14/versions"
},
{
"value": "1.38.0+really1.33.3-1ubuntu0.24.04.2",
"evidence": "/affected/14/versions"
},
{
"value": "1.38.0+really1.33.3-1ubuntu0.24.04.2+esm1",
"evidence": "/affected/14/versions"
},
{
"value": "1.38.0+really1.33.3-1ubuntu0.24.04.3",
"evidence": "/affected/14/versions"
},
{
"value": "1.38.0+really1.33.3-1ubuntu0.24.04.3+esm1",
"evidence": "/affected/14/versions"
},
{
"value": "1.38.0+really1.33.3-1ubuntu0.24.04.3+esm2",
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],
"modified": "2026-10-17T13:01:12.821756403Z",
"provider": "osv",
"upstream": [
"CVE-2026-84303"
],
"references": [
"https://ubuntu.com/security/CVE-2026-84303",
"https://www.cve.org/CVERecord?id=CVE-2026-84303",
"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"
]
},
"related_cves": [
{
"value": "CVE-2026-84303",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361255,
"published_at": "2026-09-01T19:17:00+00:00"
}