Critical
golang-google-grpc, google-guest-agent — security advisory
gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, "deny" rules defined using canonical paths (starting with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback "allow" rule was present. This affects gRPC-Go servers that use path-based authorization interceptors, such as the official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on `info.FullMethod` or `grpc.Method(ctx)`; AND that have a security policy contains specific "deny" rules for canonical paths but allows other requests by default (a fallback "allow" rule). The vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server. The fix in version 1.79.3 ensures that any request with a `:path` that does not start with a leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching authorization interceptors or handlers wi
- Products
- golang-google-grpc, google-guest-agent
- Affected versions
- 0.0~git20150514.0.f5ebd86-1, 0.0~git20150514.0.f5ebd86-2, 0.0~git20151002.0.3e7b7e5-1, 1.0.4-1, 1.22.1-1ubuntu1, 1.29.1-0ubuntu1, 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, 1.6.0-2, 1.6.0-3, 1.6.0-3ubuntu0.18.04.1, 1.64.0-6, 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, 20250116.00-0ubuntu2, 20250506.01-0ubuntu1, 20250506.01-0ubuntu1.1, 20250506.01-0ubuntu1.2, 20250506.01-0ubuntu2, 20250506.01-0ubuntu2.1, 20250506.01-0ubuntu3, 20260819.00+~20260819.00-0ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33186
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:07 UTC · Revision 1
Source evidence
gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, "deny" rules defined using canonical paths (starting with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback "allow" rule was present. This affects gRPC-Go servers that use path-based authorization interceptors, such as the official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on `info.FullMethod` or `grpc.Method(ctx)`; AND that have a security policy contains specific "deny" rules for canonical paths but allows other requests by default (a fallback "allow" rule). The vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server. The fix in version 1.79.3 ensures that any request with a `:path` that does not start with a leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching authorization interceptors or handlers wi
osv:UBUNTU-CVE-2026-33186
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
google-guest-agent
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
google-guest-agent
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
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
golang-google-grpc
Fixed versions: Not specified
google-guest-agent
Fixed versions: Not specified
Complete source record
{
"id": "db5b30a2063e8e49f2e458cf09d7b2f5cf03964908925ddf688acb48deb3f173",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-33186",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-33186",
"summary": "gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, \"deny\" rules defined using canonical paths (starting with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback \"allow\" rule was present. This affects gRPC-Go servers that use path-based authorization interceptors, such as the official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on `info.FullMethod` or `grpc.Method(ctx)`; AND that have a security policy contains specific \"deny\" rules for canonical paths but allows other requests by default (a fallback \"allow\" rule). The vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server. The fix in version 1.79.3 ensures that any request with a `:path` that does not start with a leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching authorization interceptors or handlers wi",
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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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{
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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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{
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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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{
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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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{
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"evidence": "/affected/12/versions"
},
{
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"evidence": "/affected/12/versions"
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]
},
{
"name": {
"value": "google-guest-agent",
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},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "20250506.01-0ubuntu2",
"evidence": "/affected/13/versions"
},
{
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"evidence": "/affected/13/versions"
},
{
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"evidence": "/affected/13/versions"
}
]
},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.64.0-7",
"evidence": "/affected/14/versions"
},
{
"value": "1.66.3-2",
"evidence": "/affected/14/versions"
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]
},
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],
"modified": "2026-10-17T12:58:10.577774919Z",
"provider": "osv",
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],
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"https://www.cve.org/CVERecord?id=CVE-2026-33186",
"https://github.com/grpc/grpc-go/security/advisories/GHSA-p77j-4mvh-x3m3"
]
},
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{
"value": "CVE-2026-33186",
"evidence": "/upstream"
}
],
"security_relevant": true,
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},
"source_id": "core-osv",
"document_id": 358282,
"published_at": "2026-03-20T23:16:00+00:00"
}