# Apache cxf-core: No restriction on attachment headers per message

Advisory record · `GHSA-ghvc-7hp8-2g2v`

- **Identifiers:** `GHSA-ghvc-7hp8-2g2v` · `CVE-2026-50645`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 12 Jun 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 12 Jun 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.cxf:cxf-core` (Maven): affected `>=4.2.0, <4.2.2 || >=4.0.0, <4.1.7 || <3.6.12`; fixed in `4.2.2`, `4.1.7`, `3.6.12`

## Machine-written summary

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

> Apache CXF cxf-core, Maven org.apache.cxf:cxf-core, versions 4.2.0 to before 4.2.2, 4.0.0 to before 4.1.7, and before 3.6.12, has no limit on the number of attachment headers a message can carry when deserialized. An attacker who can send messages to the service can exhaust resources and cause a denial of service. Upgrade to 4.2.2, 4.1.7, or 3.6.12, which cap attachments at 500 per message by default.

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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0046, the 40th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 12 Jun 2026, 10:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-50645)
- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-ghvc-7hp8-2g2v)

## Sources

- [GitHub Advisory Database: GHSA-ghvc-7hp8-2g2v](https://github.com/advisories/GHSA-ghvc-7hp8-2g2v)
- [OSV: GHSA-ghvc-7hp8-2g2v](https://osv.dev/vulnerability/GHSA-ghvc-7hp8-2g2v)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-50645>
- <https://cxf.apache.org/security-advisories.data/CVE-2026-50645.txt>
- <https://github.com/apache/cxf>
- <https://lists.apache.org/thread/24zb7cqcvykhwm0j797dmdq25s61mj93>
- <http://www.openwall.com/lists/oss-security/2026/06/11/12>

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-ghvc-7hp8-2g2v>, 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-ghvc-7hp8-2g2v/>. Everything for agents: <https://agentprime.io/llms.txt>.