# http4k has a potential XXE (XML External Entity Injection) vulnerability

Advisory record · `GHSA-7mj5-hjjj-8rgw`

- **Identifiers:** `GHSA-7mj5-hjjj-8rgw` · `CVE-2024-55875`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html) · [CWE-611](https://cwe.mitre.org/data/definitions/611.html) · [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md) · [XML external entities (XXE)](https://agentprime.io/advisories/tag/xxe.md) · [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 12 Dec 2024
- **Updated:** 9 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 12 Dec 2024, 19:22 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

- `org.http4k:http4k-format-xml` (Maven): affected `<6.50.0.0`; fixed in `6.50.0.0`

## 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 CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.019, the 79th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:20 UTC: First seen by agentprime
- 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-7mj5-hjjj-8rgw)

## Sources

- [GitHub Advisory Database: GHSA-7mj5-hjjj-8rgw](https://github.com/advisories/GHSA-7mj5-hjjj-8rgw)
- [OSV: GHSA-7mj5-hjjj-8rgw](https://osv.dev/vulnerability/GHSA-7mj5-hjjj-8rgw)
- <https://github.com/http4k/http4k/security/advisories/GHSA-7mj5-hjjj-8rgw>
- <https://nvd.nist.gov/vuln/detail/CVE-2024-55875>
- <https://github.com/http4k/http4k/commit/35297adc6d6aca4951d50d8cdf17ff87a8b19fbc>
- <https://github.com/http4k/http4k>
- <https://github.com/http4k/http4k/blob/25696dff2d90206cc1da42f42a1a8dbcdbcdf18c/core/format/xml/src/main/kotlin/org/http4k/format/Xml.kt#L42-L46>

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-7mj5-hjjj-8rgw>, 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-7mj5-hjjj-8rgw/>. Everything for agents: <https://agentprime.io/llms.txt>.