# Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition

Advisory record · `GHSA-5qcv-4rpc-jp93`

- **Identifiers:** `GHSA-5qcv-4rpc-jp93` · `CVE-2026-35554`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-362](https://cwe.mitre.org/data/definitions/362.html) · [CWE-416](https://cwe.mitre.org/data/definitions/416.html)
- **Tags:** [Race condition](https://agentprime.io/advisories/tag/race-condition.md) · [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Published:** 7 Apr 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Apr 2026, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.kafka:kafka-clients` (Maven): affected `>=2.8.0, <3.9.2 || >=4.0.0, <4.0.2 || >=4.1.0, <4.1.2`; fixed in `3.9.2`, `4.0.2`, `4.1.2`

## 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

- 8.7 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0045, the 39th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-5qcv-4rpc-jp93)

## Sources

- [GitHub Advisory Database: GHSA-5qcv-4rpc-jp93](https://github.com/advisories/GHSA-5qcv-4rpc-jp93)
- [OSV: GHSA-5qcv-4rpc-jp93](https://osv.dev/vulnerability/GHSA-5qcv-4rpc-jp93)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-35554>
- <https://github.com/apache/kafka/pull/21065>
- <https://github.com/apache/kafka/pull/21285>
- <https://github.com/apache/kafka/pull/21286>
- <https://github.com/apache/kafka/pull/21287>
- <https://github.com/apache/kafka/pull/21288>
- <https://github.com/apache/kafka/commit/1df2ac5b2ba4d1b5ed54b895ff6fb9539303ccb5>
- <https://github.com/apache/kafka>
- <https://issues.apache.org/jira/browse/KAFKA-19012>
- <https://lists.apache.org/thread/f07x7j8ovyqhjd1to25jsnqbm6wj01d6>
- <http://www.openwall.com/lists/oss-security/2026/04/07/6>

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-5qcv-4rpc-jp93>, 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-5qcv-4rpc-jp93/>. Everything for agents: <https://agentprime.io/llms.txt>.