# Apache ActiveMQ NMS AMQP Client has a Deserialization of Untrusted Data vulnerability

Advisory record · `GHSA-4mjw-xr5x-prpc`

- **Identifiers:** `GHSA-4mjw-xr5x-prpc` · `CVE-2025-54539`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-502](https://cwe.mitre.org/data/definitions/502.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md)
- **Published:** 16 Oct 2025
- **Updated:** 5 Nov 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 16 Oct 2025, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `Apache.NMS.AMQP` (NuGet): affected `<2.4.0`; fixed in `2.4.0`

## Machine-written summary

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

> Apache.NMS.AMQP versions before 2.4.0 (up to and including 2.3.0) are affected by a deserialization of untrusted data flaw when connecting to AMQP servers. A malicious server the client connects to could send crafted responses that lead to arbitrary code execution on the client. Upgrade to Apache.NMS.AMQP 2.4.0 or later, which fixes the issue.

Written 9 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.021, the 81st percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:22 UTC: First seen by agentprime
- 31 Oct 2026, 15:22 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-4mjw-xr5x-prpc)

## Sources

- [GitHub Advisory Database: GHSA-4mjw-xr5x-prpc](https://github.com/advisories/GHSA-4mjw-xr5x-prpc)
- [OSV: GHSA-4mjw-xr5x-prpc](https://osv.dev/vulnerability/GHSA-4mjw-xr5x-prpc)
- <https://nvd.nist.gov/vuln/detail/CVE-2025-54539>
- <https://github.com/apache/activemq-nms-amqp>
- <https://lists.apache.org/thread/9k684j07ljrshy3hxwhj5m0xjmkz1g2n>
- <http://www.openwall.com/lists/oss-security/2025/10/15/3>

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-4mjw-xr5x-prpc>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-4mjw-xr5x-prpc/>. Everything for agents: <https://agentprime.io/llms.txt>.