TL;DR
A Cyata Research blog post published Dec. 25, 2025, by Yarden Porat identifies a vulnerability labeled "LangGrinch" affecting LangChain Core and references CVE-2025-68664. Specific technical details, affected versions, and mitigation steps are not confirmed in the available source.
What happened
On December 25, 2025 Cyata Research published a report by Yarden Porat that names a vulnerability, referred to as "LangGrinch," impacting LangChain Core and cites CVE-2025-68664. The post appears on Cyata.ai and carries the headline linking the LangGrinch label to LangChain Core. The available excerpt from the source also references a separate Cyata Research note about a critical flaw in "Cursor MCP Installation," though the relationship between that item and the LangGrinch report is not specified in the source material provided. Beyond the CVE identifier and the label used by the researchers, the source does not include exploited vectors, affected releases, proof-of-concept code, or confirmed remediation guidance. Additional technical and operational information is not confirmed in the source.
Why it matters
- A CVE assignment signals a formally recognized security issue that could affect projects and deployments relying on LangChain Core.
- LangChain Core is a component used in development of AI applications; vulnerabilities there can have downstream consequences for many systems built on top of it.
- Organizations using LangChain-based stacks will likely need authoritative guidance from maintainers or researchers to assess exposure and apply fixes.
- The presence of multiple research notes on Cyata (including a Cursor MCP installation flaw) highlights ongoing scrutiny of AI tooling security.
Key facts
- Report author: Yarden Porat.
- Publisher: Cyata Research (posted on Cyata.ai).
- Publication date: December 25, 2025.
- Vulnerability label in the report: "LangGrinch."
- CVE identifier cited: CVE-2025-68664.
- Headline ties LangGrinch specifically to LangChain Core.
- Source URL: https://cyata.ai/blog/langgrinch-langchain-core-cve-2025-68664/
- Technical details, severity rating, affected versions, and mitigation steps are not confirmed in the source.
What to watch next
- Vendor advisories or security bulletins from the LangChain project for confirmed impact and patches — not confirmed in the source.
- Public disclosure of technical details, proof-of-concept code, or exploit reports that would clarify attack vectors and severity — not confirmed in the source.
- Coordinated responses or patch releases from downstream projects that bundle LangChain Core — not confirmed in the source.
Quick glossary
- LangChain: A framework and set of developer tools used to build applications that orchestrate language models and related components.
- CVE: Common Vulnerabilities and Exposures, a standardized identifier assigned to publicly known cybersecurity vulnerabilities.
- Vulnerability: A weakness in software or hardware that could be exploited to compromise confidentiality, integrity, or availability.
- Proof of Concept (PoC): A demonstration showing how a vulnerability can be exploited; used to validate severity and reproduce issues.
Reader FAQ
Who published the report on LangGrinch?
The report was published by Yarden Porat on the Cyata.ai blog (Cyata Research).
What exactly does the LangGrinch vulnerability allow an attacker to do?
Not confirmed in the source.
Which LangChain versions are affected?
Not confirmed in the source.
Is there a patch or mitigation available?
Not confirmed in the source.
Dec 19, 2025 • 2 min read Cyata Research: Critical Flaw in Cursor MCP Installation As originally published at SiliconANGLE, a new report out today from artificial intelligence… Written by Duncan…
Sources
- All I Want for Christmas Is Your Secrets: LangGrinch hits LangChain Core
- CVE-2025-68664 Detail – NVD
- CVE-2025-68664 LangChain Serialization Injection
- The "lc" Leak: Critical 9.3 Severity LangChain Flaw Turns …
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