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High, CVSS 7.5

gRPC-Go HTTP/2 Rapid Reset vulnerability

GHSA-m425-mq94-257g

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (google.golang.org/grpc 1.58.3, 1.57.1, 1.56.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Impact In affected releases of gRPC-Go, it is possible for an attacker to send HTTP/2 requests, cancel them, and send subsequent requests, which is valid by the HTTP/2 protocol, but would cause the gRPC-Go server to launch more concurrent method handlers than the configured maximum stream limit. Patches This vulnerability was addressed by #6703 and has been included in patch releases: 1.56.3, 1.57.1, 1.58.3. It is also included in the latest release, 1.59.0. Along with applying the patch, users should also ensure they are using the grpc.MaxConcurrentStreams server option to apply a limit to the server's resources used for any single connection. Workarounds None. References #6703

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-m425-mq94-257g

Agent brief

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# Patch Next advisory brief: GHSA-m425-mq94-257g

Advisory: gRPC-Go HTTP/2 Rapid Reset vulnerability
IDs: GHSA-m425-mq94-257g
Record: https://patchnext.com/advisories/ghsa-m425-mq94-257g (revision 1, source checked 26 Oct 2026, 15:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: google.golang.org/grpc 1.58.3, 1.57.1, 1.56.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go google.golang.org/grpc: affected < 1.56.3; >= 1.57.0, < 1.57.1; >= 1.58.0, < 1.58.3; fixed in 1.58.3, 1.57.1, 1.56.3

## Suggested inspection (read-only)
- Go google.golang.org/grpc: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on google.golang.org/grpc.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-m425-mq94-257g (GitHub-reviewed advisory GHSA-m425-mq94-257g lists affected ranges: Go google.golang.org/grpc >=0 =1.57.0 =1.58.0 <1.58.3)

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