fix(security): update module google.golang.org/grpc to v1.83.1 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
google.golang.org/grpc	v1.82.1 → v1.83.1

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gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation

CVE-2026-84304 / GHSA-vp52-pcj8-j9qc

More information

Details

Impact

An unauthenticated remote attacker can initiate a gRPC stream and purposefully fragment their payload into millions of tiny (e.g., 1-byte) HTTP/2 DATA frames. Even if the total payload volume falls within the configured connection and stream flow-control windows, each independent fragment incurs memory overhead due to internal tracking structures and queue allocation.

Repeated fragmentation massively inflates the heap space consumed by the stream. An attacker multiplexing multiple concurrent streams can exhaust the memory bounds of the runtime, forcing a runtime panic or OutOfMemory condition and leading to a remote Denial of Service (DoS).

Patches

The change to fix this issue is merged in master and a patch release, 1.83.1, has been published that contains this fix.

Workarounds

This vulnerability is mitigated by implementing receive buffer compaction. Consecutive small data buffers are automatically coalesced into larger buffers from a shared pool once the overhead is perceived to be excessive relative to actual payload data, drastically minimizing per-frame memory overheads.

This behavior is enabled by default. A temporary escape hatch is provided via the environment variable GRPC_GO_EXPERIMENTAL_ENABLE_RECEIVE_BUFFER_COMPACTION=false to disable the feature if unforeseen issues arise, but it will be removed in a future release.

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

References

• https://github.com/grpc/grpc-go/security/advisories/GHSA-vp52-pcj8-j9qc
• https://nvd.nist.gov/vuln/detail/CVE-2026-84304
• https://github.com/grpc/grpc-go/pull/9331
• https://github.com/grpc/grpc-go/pull/9333
• https://github.com/grpc/grpc-go/commit/7354d9c8debb4bcf2225bf429857078de310c176
• https://github.com/grpc/grpc-go/commit/8cfeca0e1ee5ea0980dcc320e20240fa1079ec77
• https://github.com/grpc/grpc-go/releases/tag/v1.83.1
• https://github.com/advisories/GHSA-vp52-pcj8-j9qc

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

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Release Notes

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

v1.83.1: Release 1.83.1

Compare Source

Security

• xds/rbac: Fix a bug where nested Principal or Permission rules with :scheme or grpc- prefixed header matchers were not rejected, which could cause DENY rules to fail open. (#​9258)
  • Special Thanks: @​nvxbug
• xds/rbac: Fix a bug where the host header matcher was not being replaced with :authority in nested Principal or Permission rules. (#​9258)
  • Special Thanks: @​nvxbug
• xds/rbac: Fix a bug where a header matcher whose name was not lowercase, such as X-Role, matched no header, which could cause DENY rules to fail open. (#​9332)
  • Special Thanks: @​alimony
• xds/rbac: Fix a bug where a :scheme or grpc- prefixed header matcher was accepted when its name was not lowercase. (#​9332)
  • Special Thanks: @​alimony
• xds/rbac: Fix a bug where a Host header matcher was not replaced with :authority. (#​9332)
  • Special Thanks: @​alimony

Performance

• transport: Restrict memory overhead of buffering small data frames. (#​9331)

v1.83.0: Release 1.83.0

Compare Source

Security

• server: Stop reading from connections when flooded by HTTP/2 frames to mitigate resource exhaustion. The default value for this limit is 100 frames, excluding DATA and HEADERS, and may be changed by setting environment variable GRPC_GO_EXPERIMENTAL_CONTROL_BUFFER_THROTTLE_LIMIT.
• xds/rbac: Support Metadata and RequestedServerName permissions matcher fields. If present in a DENY rule, previously these would be ignored and fail-open.
• xds/rbac: Fix panic when parsing unsupported fields in NotRule/NotId permissions.
• xds/rbac: Support the deprecated source_ip principal identifier by treating it as equivalent to direct_remote_ip.
• xds: Fix panic when parsing route header matchers configured with empty exact_match, prefix_match, or suffix_match strings. (#​9223)

New Features

• xds/googlec2p: Enable DirectPath over Interconnect support for on-premises clients via the force-xds target URI query parameter. (#​9133)
• xds: Enable xDS configuration to control which fields get propagated from ORCA backend metric reports to LRS load reports. (#​9145)
• authz: Add OnPolicyUpdate callback to FileWatcherOptions to notify when an authz policy is loaded or updated. (#​9142)
  • Special Thanks: @​hnefatl
• xds: Add support for the GCP Authentication HTTP Filter, which automatically fetches and attaches GCP Service Account Identity JWT tokens to outgoing RPCs.
  • This feature can be enabled by setting environment variable GRPC_EXPERIMENTAL_XDS_GCP_AUTHENTICATION_FILTER=true. (#​9119)
• xds: Add support for xDS-based HTTP CONNECT proxies.
  • This feature can be enabled by setting environment variable GRPC_EXPERIMENTAL_XDS_HTTP_CONNECT=true. (#​9151)
• xds: Add support for contains_match in route header matchers. (#​9223)

Bug Fixes

• credentials/alts: Fix panic when processing malformed frames by validating that the message frame length exceeds the message type field size. (#​9197)
• grpc: Fix compilation on Plan 9 targets (GOOS=plan9), broken since v1.81.0. (#​9255)
  • Special Thanks: @​Yusufihsangorgel

v1.82.2: Release 1.82.2

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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[renovate]

⚠️ Artifact update problem

Renovate failed to update artifacts related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

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The artifact failure details are included below:

File name: flagd-proxy/go.sum

Command failed: go get -t ./...
go: downloading github.com/dimiro1/banner v1.1.0
go: downloading github.com/mattn/go-colorable v0.1.14
go: downloading github.com/open-feature/flagd/core v0.15.6
go: downloading github.com/spf13/cobra v1.9.1
go: downloading github.com/spf13/viper v1.20.1
go: downloading github.com/common-nighthawk/go-figure v0.0.0-20210622060536-734e95fb86be
go: downloading github.com/mattn/go-isatty v0.0.20
go: downloading github.com/inconshreveable/mousetrap v1.1.0
go: downloading github.com/go-viper/mapstructure/v2 v2.4.0
go: downloading github.com/sagikazarmark/locafero v0.7.0
go: downloading github.com/spf13/afero v1.15.0
go: downloading github.com/spf13/cast v1.7.1
go: downloading github.com/sourcegraph/conc v0.3.0
go: downloading github.com/subosito/gotenv v1.6.0
go: downloading github.com/pelletier/go-toml/v2 v2.2.3
go: downloading github.com/open-feature/flagd/core v0.16.2
go: downloading github.com/open-feature/flagd v0.4.2
go: github.com/open-feature/flagd/flagd-proxy/cmd imports
	github.com/open-feature/flagd/core/pkg/fips: cannot find module providing package github.com/open-feature/flagd/core/pkg/fips

File name: flagd/go.sum

Command failed: go get -t ./...
go: downloading buf.build/gen/go/open-feature/flagd/connectrpc/go v1.19.1-20260217192757-1388a552fc3c.2
go: downloading github.com/rs/xid v1.6.0
go: downloading github.com/gorilla/mux v1.8.1
go: downloading github.com/launchdarkly/eventsource v1.11.0
go: downloading github.com/rs/cors v1.11.1
go: downloading github.com/cpuguy83/go-md2man/v2 v2.0.6
go: downloading github.com/russross/blackfriday/v2 v2.1.0
go: github.com/open-feature/flagd/flagd/cmd imports
	github.com/open-feature/flagd/core/pkg/fips: cannot find module providing package github.com/open-feature/flagd/core/pkg/fips

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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