# gRPC connection termination issue

Advisory record · `GHSA-9hxf-ppjv-w6rq`

- **Identifiers:** `GHSA-9hxf-ppjv-w6rq` · `CVE-2023-32732` · `PYSEC-2026-1426`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-440](https://cwe.mitre.org/data/definitions/440.html)
- **Tags:** [CWE-440](https://agentprime.io/advisories/tag/cwe-440.md)
- **Published:** 6 Jul 2023
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 6 Jul 2023, 21:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `io.grpc:grpc-protobuf` (Maven): affected `>=1.53.0, <1.53.1 || >=1.54.0, <1.54.2`; fixed in `1.53.1`, `1.54.2`
- `grpcio` (PyPI): affected `>=1.53.0, <1.53.1 || >=1.54.0, <1.54.2`; fixed in `1.53.1`, `1.54.2`
- `grpc` (RubyGems): affected `>=1.53.0, <1.53.1 || >=1.54.0, <1.54.2`; fixed in `1.53.1`, `1.54.2`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> grpc-protobuf (io.grpc), grpcio and grpc are affected in versions 1.53.0 before 1.53.1 and 1.54.0 before 1.54.2. A client can send a malformed base64 header with a -bin suffix, causing the gRPC server to drop its connection with an HTTP/2 proxy. Upgrade to 1.53.1 or 1.54.2.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`, from CNA (Google)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0053, the 44th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:18 UTC: First seen by agentprime
- 31 Oct 2026, 14:18 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-9hxf-ppjv-w6rq)

## Sources

- [GitHub Advisory Database: GHSA-9hxf-ppjv-w6rq](https://github.com/advisories/GHSA-9hxf-ppjv-w6rq)
- [OSV: GHSA-9hxf-ppjv-w6rq](https://osv.dev/vulnerability/GHSA-9hxf-ppjv-w6rq)
- <https://nvd.nist.gov/vuln/detail/CVE-2023-32732>
- <https://github.com/grpc/grpc/pull/32309>
- <https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10>
- <https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946>
- <https://github.com/grpc/grpc/releases/tag/v1.53.1>
- <https://github.com/grpc/grpc/releases/tag/v1.54.2>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32732.yml>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/37IDNVY5AWVH7JDMM2SDTL24ZPPZJNSY>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VWE44J5FG7THHL7XVEVTNIGEYBNKJBLL>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-9hxf-ppjv-w6rq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-9hxf-ppjv-w6rq/>. Everything for agents: <https://agentprime.io/llms.txt>.