---
title: "Security digest: September 22, 2025"
url: https://erroneo.us/security/2025-09-22/
description: "September 22, 2025 vulnerability digest: 1 critical advisory (Maven, PyPI). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2025-09-22
date_modified: 2025-09-22
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: September 22, 2025

1 critical advisory.

## Take stock

- Maven: 1 critical advisory ( ai.h2o:h2o-core ). Check with mvn dependency:tree -Dincludes=<groupId>:<artifactId> .
- PyPI: 1 critical advisory ( h2o ). Check with pip-audit (or: pip show <package>) .
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Known exploited (CISA KEV)

None.

## Critical advisories

- [CVE-2025-6544](https://erroneo.us/security/cve/CVE-2025-6544/index.md) H2O affected by a deserialization vulnerability — Maven ai.h2o:h2o-core <= 3.46.0.7 → no fix; PyPI h2o <= 3.46.0.7 → no fix

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Source page: https://erroneo.us/security/2025-09-22/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt