---
title: "Security digest: December 23, 2025"
url: https://erroneo.us/security/2025-12-23/
description: "December 23, 2025 vulnerability digest: 1 brief (LangGrinch); 2 critical advisories (PyPI). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2025-12-23
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: December 23, 2025

1 editorial brief and 2 critical advisories.

## Take stock

- Patch this week: LangGrinch . Teams running LangChain apps that stream events with astream_events v1 or astream_log, persist message history, or load serialized objects that can contain LLM output or user data.
- PyPI: 2 critical advisories ( smolagents , langchain-core ). 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.

## Editorial briefs

- **Patch this week** [LangGrinch: LangChain Core Serialization Injection](https://erroneo.us/security/briefs/langgrinch-langchain-core-serialization-injection/index.md): A real design flaw in a library almost every Python agent stack pulls in, but it needs a serialize-then-deserialize path over attacker-influenced data; bump langchain-core in your next routine dependency update.

## Known exploited (CISA KEV)

None.

## Critical advisories

- [CVE-2025-14931](https://erroneo.us/security/cve/CVE-2025-14931/index.md) Hugging Face smolagents: Unsafe deserialization in Remote Python Executor leads to RCE — PyPI smolagents <= 1.23.0 → no fix
- [CVE-2025-68664](https://erroneo.us/security/cve/CVE-2025-68664/index.md) LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs — PyPI langchain-core >= 1.0.0, < 1.2.5 → 1.2.5; PyPI langchain-core < 0.3.81 → 0.3.81

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Source page: https://erroneo.us/security/2025-12-23/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt