[scality-renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google.golang.org/grpc	v1.83.1 → v1.83.2

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gRPC-Go xDS servers: Denial of Service (DoS) via crash due to missing :authority and Host headers

CVE-2026-84445 / GHSA-2v4p-qf9q-27wj

More information

Details

A vulnerability exists in gRPC-Go servers configured with xds.NewGRPCServer() where a crafted request missing both :authority and Host headers can cause a server panic, resulting in a Denial of Service (DoS).

Servers built with xds.NewGRPCServer install an xDS routing interceptor on every RPC. This interceptor looks up the request’s :authority header to pick a virtual host. The HTTP/2 server transport previously accepted requests that had neither :authority nor Host. When this happened, the xDS routing interceptor attempted to access the first element of an empty slice of authorities, leading to an index out of bounds panic. Since the per-RPC goroutine does not recover from panics, the entire server process would terminate.

This panic occurs in the interceptor pipeline, meaning the transport credentials handshake (TLS, mTLS, or ALTS) and HTTP/2 connection establishment must complete successfully before the crafted request can reach this logic.

• Insecure/Standard TLS: If the server permits insecure (plaintext) connections or standard credentials (where client certs are not checked), any unauthenticated remote attacker can trigger the crash.
• mTLS / ALTS: If strict transport-level authentication is enforced at the network edge or transport layer (e.g., requiring a valid client certificate), the attacker must possess valid transport credentials to initiate the stream and trigger the panic.

Impact

An attacker can cause a complete outage of the gRPC server by sending a request missing both :authority and Host headers, provided they can successfully establish a transport connection.

Patches

The issue has been addressed in master (and backported to 1.84.0, 1.83.2 and 1.82.2). The fix updates the HTTP/2 transport layer to reject requests missing both :authority and Host headers early, maintaining consistency with and other gRPC language implementations.

Severity

• CVSS Score: 8.7 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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

References

• https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj
• https://github.com/grpc/grpc-go/issues/9354
• https://github.com/grpc/grpc-go/pull/9365
• https://github.com/grpc/grpc-go/pull/9366
• https://github.com/grpc/grpc-go/pull/9367
• https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7
• https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4
• https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f
• https://github.com/grpc/grpc-go/releases/tag/v1.82.2
• https://github.com/grpc/grpc-go/releases/tag/v1.83.2
• https://nvd.nist.gov/vuln/detail/CVE-2026-84445
• https://github.com/advisories/GHSA-2v4p-qf9q-27wj

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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gRPC-Go xDS servers: Denial of Service (DoS) via crash due to missing :authority and Host headers

CVE-2026-84445 / GHSA-2v4p-qf9q-27wj / GO-2026-6443

More information

Details

A vulnerability exists in gRPC-Go servers configured with xds.NewGRPCServer() where a crafted request missing both :authority and Host headers can cause a server panic, resulting in a Denial of Service (DoS).

Servers built with xds.NewGRPCServer install an xDS routing interceptor on every RPC. This interceptor looks up the request’s :authority header to pick a virtual host. The HTTP/2 server transport previously accepted requests that had neither :authority nor Host. When this happened, the xDS routing interceptor attempted to access the first element of an empty slice of authorities, leading to an index out of bounds panic. Since the per-RPC goroutine does not recover from panics, the entire server process would terminate.

This panic occurs in the interceptor pipeline, meaning the transport credentials handshake (TLS, mTLS, or ALTS) and HTTP/2 connection establishment must complete successfully before the crafted request can reach this logic.

• Insecure/Standard TLS: If the server permits insecure (plaintext) connections or standard credentials (where client certs are not checked), any unauthenticated remote attacker can trigger the crash.
• mTLS / ALTS: If strict transport-level authentication is enforced at the network edge or transport layer (e.g., requiring a valid client certificate), the attacker must possess valid transport credentials to initiate the stream and trigger the panic.

Impact

An attacker can cause a complete outage of the gRPC server by sending a request missing both :authority and Host headers, provided they can successfully establish a transport connection.

Patches

The issue has been addressed in master (and backported to 1.84.0, 1.83.2 and 1.82.2). The fix updates the HTTP/2 transport layer to reject requests missing both :authority and Host headers early, maintaining consistency with and other gRPC language implementations.

Severity

• CVSS Score: 8.7 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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

References

• https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj
• https://nvd.nist.gov/vuln/detail/CVE-2026-84445
• https://github.com/grpc/grpc-go/issues/9354
• https://github.com/grpc/grpc-go/pull/9365
• https://github.com/grpc/grpc-go/pull/9366
• https://github.com/grpc/grpc-go/pull/9367
• https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7
• https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4
• https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f
• https://github.com/grpc/grpc-go
• https://github.com/grpc/grpc-go/releases/tag/v1.82.2
• https://github.com/grpc/grpc-go/releases/tag/v1.83.2

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

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Server panic via missing authority or Host headers in google.golang.org/grpc

CVE-2026-84445 / GHSA-2v4p-qf9q-27wj / GO-2026-6443

More information

Details

In google.golang.org/grpc, servers configured with xDS routing can panic when processing requests that lack both :authority and Host headers. The HTTP/2 transport layer accepted requests missing these headers, and the xDS server routing interceptor attempted to index the empty authority slice, causing an unhandled panic and terminating the server.

Severity

Unknown

References

• https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj
• https://github.com/grpc/grpc-go/issues/9354
• https://github.com/grpc/grpc-go/pull/9365

This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).

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Release Notes

grpc/grpc-go (google.golang.org/grpc)

v1.83.2: Release 1.83.2

Compare Source

Security

• server: Reject requests missing both :authority and Host headers with HTTP 400 and status Internal. (#​9365)
  • Special Thanks: @​winklemad

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This PR has been generated by Mend Renovate CLI.

[scality-renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 4 additional dependencies were updated

Details:

Package	Change
golang.org/x/mod	v0.37.0 -> v0.38.0
golang.org/x/net	v0.57.0 -> v0.58.0
golang.org/x/text	v0.40.0 -> v0.41.0
golang.org/x/tools	v0.47.0 -> v0.48.0

[github-actions]

Dependency Bump Evaluation

Version change: google.golang.org/grpc v1.83.1 -> v1.83.2
Semver bump type: patch

Changes:

• Security-only release: the HTTP/2 server transport now rejects requests missing both :authority and Host headers (HTTP 400 / status Internal) (transport: reject requests missing :authority and host headers grpc/grpc-go#9365)
• The diff touches only the grpc lines in go.mod/go.sum. No other modules change.

Breaking changes: None. The only behavior change is that malformed requests with no authority are now rejected.

Security concerns: Fixes CVE-2026-84445 / GHSA-2v4p-qf9q-27wj / GO-2026-6443 (CVSS 8.7), a server panic (DoS) in servers built with xds.NewGRPCServer(). No new dependencies.

Impact on codebase: grpc is // indirect only, pulled in through the k8s/controller-runtime/OpenTelemetry deps. The repo has no direct grpc or xds imports and runs no gRPC server, so the vulnerable path cannot be reached in this operator. The bump is still worth taking to clear scanner findings.

Recommendation: SAFE TO MERGE once CI is green

Notes: CI checks (build, generate, lint, test, test-e2e) were still running when this was evaluated, so wait for them to pass. This PR was not auto-approved: it is authored by scality-renovate[bot], and only dependabot PRs get auto-approved, so a human needs to approve it. (Updated: an earlier version of this comment listed transitive golang.org/x/* bumps that are no longer in the PR.)

— Claude Code