Is there a public exploit for CVE-2026-44843?

No public exploit for CVE-2026-44843 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-44843?

CVE-2026-44843 scores CVSS 8.2 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.41%.

What does CVE-2026-44843 affect?

CVE-2026-44843 affects langchain-ai langchain-core. It is part of the AI and agent stack (LangChain).

8.2 High

LangChain is a framework for building agents and LLM-powered applications.

CVE-2026-44843

LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using overly broad object allowlists. These paths may call load() with allowedobjects="all". This does not enable arbitrary Python object deserialization, but it does allow any trusted LangChain-serializable object to be revived, which is broader than these runtime paths require. As a result, attacker-supplied LangChain serialized constructor dictionaries may cause trusted runtime paths to instantiate classes with untrusted constructor arguments. Applications are exposed only when all of the following are true: 1. The application accepts untrusted structured input, such as JSON, from a user or network request. 2. The application does not validate or canonicalize that input into an inert schema before invoking LangChain. 3. Attacker-controlled nested dictionaries or lists are preserved in LangChain run inputs or outputs. 4. The application uses an affected API path that later deserializes that run data. Known affected runtime surfaces include: RunnableWithMessageHistory astreamlog() astreamevents(version="v1") Related unsafe deserialization patterns may…

Part of the AI stack

This affects LangChain, in Agent frameworks.

Assessment

CVSS: 8.2 (v3.1)
Severity: High
EPSS: 0.41% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 8 May 2026
Last updated: 24 July 2026
Affected: langchain-ai · langchain · langchain-core
Weakness: CWE-502
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

At the source

References

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