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Medium, CVSS 5.3amended

gRPC connection termination issue

CVE-2023-32732GHSA-9hxf-ppjv-w6rq

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.grpc:grpc-protobuf 1.54.2, 1.53.1; grpc 1.54.2, 1.53.1; grpcio 1.54.2, 1.53.1), 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

  • Maven io.grpc:grpc-protobuf

    Affected
    >= 1.53.0, < 1.53.1>= 1.54.0, < 1.54.2
    Fixed in
    1.53.1, 1.54.2

  • RubyGems grpc

    Affected
    >= 1.53.0, < 1.53.1>= 1.54.0, < 1.54.2
    Fixed in
    1.53.1, 1.54.2

  • PyPI grpcio

    Affected
    >= 1.53.0, < 1.53.1>= 1.54.0, < 1.54.2
    Fixed in
    1.53.1, 1.54.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS
  • CVE-2023-32732: 0.53% estimated exploitation activity in the next 30 days; percentile 44.67 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy and a gRPC server: a base64 encoding error for -bin suffixed headers will result in a disconnection by the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in https://github.com/grpc/grpc/pull/32309.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-9hxf-ppjv-w6rq

  2. Revision 1 · created ·

    Published from osv record GHSA-9hxf-ppjv-w6rq

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2023-32732

Advisory: gRPC connection termination issue
IDs: CVE-2023-32732, GHSA-9hxf-ppjv-w6rq
Record: https://patchnext.com/advisories/cve-2023-32732 (revision 2, source checked 26 Oct 2026, 13:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: io.grpc:grpc-protobuf 1.54.2, 1.53.1; grpc 1.54.2, 1.53.1; grpcio 1.54.2, 1.53.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.grpc:grpc-protobuf: affected >= 1.53.0, < 1.53.1; >= 1.54.0, < 1.54.2; fixed in 1.53.1, 1.54.2
- RubyGems grpc: affected >= 1.53.0, < 1.53.1; >= 1.54.0, < 1.54.2; fixed in 1.53.1, 1.54.2
- PyPI grpcio: affected >= 1.53.0, < 1.53.1; >= 1.54.0, < 1.54.2; fixed in 1.53.1, 1.54.2

## Suggested inspection (read-only)
- Maven io.grpc:grpc-protobuf: check the installed version with your package manager.
- RubyGems grpc: check the installed version with your package manager.
- `python -m pip show grpcio`: prints the installed version. Run with the environment that serves production active.

## 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 io.grpc:grpc-protobuf, grpc, grpcio.
- 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://osv.dev/vulnerability/GHSA-9hxf-ppjv-w6rq (OSV record GHSA-9hxf-ppjv-w6rq lists affected ranges: Maven io.grpc:grpc-protobuf >=1.53.0 =1.54.0 =1.53.0 =1.54.0 =1.53.0 =1.54.0 <1.54.2 (fixed))
- Verified: https://github.com/advisories/GHSA-9hxf-ppjv-w6rq (GitHub-reviewed advisory GHSA-9hxf-ppjv-w6rq lists affected ranges: Maven io.grpc:grpc-protobuf >=1.53.0 =1.54.0 =1.53.0 =1.54.0 =1.53.0 =1.54.0 <1.54.2)

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