Critical vulnerability in LangChain – CVE-2025

News.Ycombinator • December 25, 2025

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Written by Duncan Riley

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical LangChain Vulnerability Enables Secret Exfiltration A critical vulnerability in LangChain’s core library (CVE-2025-68664) was discovered, allowing attackers to exfiltrate sensitive environment variables and potentially execute code through deserialization flaws. The issue, affecting a widely used AI framework with hundreds of millions of downloads, was patched just before Christmas 2025. 6 sources 45

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