# Apache Kafka Deserialization of Untrusted Data vulnerability

Advisory record · `GHSA-76qp-h5mr-frr4`

- **Identifiers:** `GHSA-76qp-h5mr-frr4` · `BIT-kafka-2025-27818` · `CVE-2025-27818`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-502](https://cwe.mitre.org/data/definitions/502.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md)
- **Published:** 10 Jun 2025
- **Updated:** 11 Dec 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 10 Jun 2025, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.kafka:kafka_2.11` (Maven): affected `>=2.3.0, <=2.4.1`; no fixed version yet
- `org.apache.kafka:kafka_2.12` (Maven): affected `>=2.3.0, <3.9.1`; fixed in `3.9.1`
- `org.apache.kafka:kafka_2.13` (Maven): affected `>=2.4.0, <3.9.1`; fixed in `3.9.1`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.011, the 67th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:09 UTC: First seen by agentprime
- 31 Oct 2026, 15:09 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-76qp-h5mr-frr4)

## Sources

- [GitHub Advisory Database: GHSA-76qp-h5mr-frr4](https://github.com/advisories/GHSA-76qp-h5mr-frr4)
- [OSV: GHSA-76qp-h5mr-frr4](https://osv.dev/vulnerability/GHSA-76qp-h5mr-frr4)
- <https://nvd.nist.gov/vuln/detail/CVE-2025-27818>
- <https://github.com/apache/kafka>
- <https://kafka.apache.org/cve-list>
- <http://www.openwall.com/lists/oss-security/2025/06/09/2>

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-76qp-h5mr-frr4>, 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-76qp-h5mr-frr4/>. Everything for agents: <https://agentprime.io/llms.txt>.