---
title: "Security digest: June 20, 2025"
url: https://erroneo.us/security/2025-06-20/
description: "June 20, 2025 vulnerability digest: 2 critical advisories (Go, PyPI). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2025-06-20
date_modified: 2025-06-20
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: June 20, 2025

2 critical advisories.

## Take stock

- Go: 1 critical advisory ( github.com/mattermost/mattermost-server , github.com/mattermost/mattermost/server/v8 ). Check with govulncheck ./... .
- PyPI: 1 critical advisory ( rfc3161-client ). 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-2025-4981](https://erroneo.us/security/cve/CVE-2025-4981/index.md) Mattermost allows authenticated users to write files to arbitrary locations — Go github.com/mattermost/mattermost-server < 0.0.0-20250519205859-65aec10162f6 → 0.0.0-20250519205859-65aec10162f6; Go github.com/mattermost/mattermost/server/v8 < 8.0.0-20250519205859-65aec10162f6 → 8.0.0-20250519205859-65aec10162f6; Go github.com/mattermost/mattermost/server/v8 >= 10.5.0, <= 10.5.5 → 10.5.6
- [CVE-2025-52556](https://erroneo.us/security/cve/CVE-2025-52556/index.md) rfc3161-client has insufficient verification for timestamp response signatures — PyPI rfc3161-client <= 1.0.2 → 1.0.3

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Source page: https://erroneo.us/security/2025-06-20/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt