TL;DR
A Cyata Research report published Dec. 25, 2025 identifies a critical vulnerability in LangChain Core, labeled "LangGrinch" and assigned CVE-2025-68664. The Cyata post and linked coverage raise the issue; specifics about affected versions, exploitability and mitigations are not detailed in the provided source.
What happened
A research post published by Cyata Research on December 25, 2025, authored by Yarden Porat, describes a critical security issue in LangChain Core that the report dubs "LangGrinch" and associates with CVE-2025-68664. The Cyata entry appears on the cyata.ai blog and is presented as analysis of a serious flaw; an earlier note in the source references a separate Cyata item about a "Critical Flaw in Cursor MCP Installation." The available excerpt identifies the vulnerability and the CVE identifier but does not provide technical details, impacted LangChain versions, proof-of-concept code or remediation steps. The post also notes an original publication link to SiliconANGLE in related Cyata content, but the supplied material does not confirm whether LangChain maintainers have released advisories or patches, nor whether the flaw is actively exploited in the wild.
Why it matters
- Critical flaws in core AI libraries can affect many downstream applications that embed the library.
- A vulnerability with a CVE designation signals a tracked security issue that may require coordinated patching efforts.
- Unconfirmed details about impact or mitigations increase uncertainty for teams that rely on LangChain in production.
- Supply-chain and dependency risks are heightened when popular SDKs or frameworks receive security disclosures.
Key facts
- Reporter: Cyata Research (post authored by Yarden Porat).
- Publication date of the Cyata post: December 25, 2025.
- Vulnerability label used in the Cyata post: "LangGrinch."
- CVE identifier cited in the post: CVE-2025-68664.
- Source URL: https://cyata.ai/blog/langgrinch-langchain-core-cve-2025-68664/ (as supplied).
- The source material does not include technical details, exploit demonstration, or fixed versions.
- An earlier Cyata item referenced in the source mentions a separate issue titled 'Critical Flaw in Cursor MCP Installation.'
- The supplied excerpt references an original publication link to SiliconANGLE for related Cyata research.
What to watch next
- Whether LangChain maintainers publish an advisory or security bulletin — not confirmed in the source.
- Availability of patches or updated versions from LangChain that address CVE-2025-68664 — not confirmed in the source.
- Independent technical analyses or proof-of-concept reports that detail the vulnerability and attack vectors — not confirmed in the source.
Quick glossary
- CVE: Common Vulnerabilities and Exposures, a cataloging system that assigns identifiers to publicly known cybersecurity vulnerabilities.
- LangChain: An open-source framework commonly used to build applications that chain together language model calls and other components; definition kept general.
- Vulnerability: A flaw or weakness in software that could potentially be exploited to cause unintended behavior, data exposure or service disruption.
- Proof of Concept (PoC): A demonstration that a particular vulnerability can be exploited; may be used by researchers to characterize impact.
Reader FAQ
What is CVE-2025-68664?
It is the identifier referenced by Cyata Research for a critical vulnerability in LangChain Core that the report names 'LangGrinch.' Further technical details are not provided in the supplied source.
Is my deployment of LangChain affected?
Not confirmed in the source. The Cyata post identifies a critical issue but does not list affected versions or configuration conditions.
Has LangChain released a patch or advisory?
Not confirmed in the source. The provided material does not indicate whether the LangChain project has issued fixes or guidance.
Where was this research published?
The report is on the Cyata Research blog (cyata.ai) published December 25, 2025 and authored by Yarden Porat; related Cyata content references an original publication at SiliconANGLE.
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
- Critical vulnerability in LangChain – CVE-2025-68664
- CVE-2025-68664 Detail – NVD
- CVE-2025-68664 LangChain Serialization Injection
- langchain
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