What is CVE-2026-44843?

CVE-2026-44843 is a high-severity vulnerability in Langchain, classified under Deserialization of Untrusted Data. CVSS score: 8.2/10. Published 2026-05-26.

How severe is CVE-2026-44843?

High severity. CVSS v3 base score is 8.2 out of 10.

Deserialization in Langchain

CVE-2026-44843

LangChain is a framework for building agents and LLM-powered applications. Prior to 0.3.85 and 1.3.3, LangChain contains older runtime code paths that deserialize run inputs, run outputs, or other application-controlled payloads using over…

Vulnerability class: Insecure Deserialization

EPSS: 0.000 (14.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

Affected products

Langchain
Langchain-ai Langchain — versions < 0.3.85, >= 1.0.0a1, < 1.3.3

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44843?: CVE-2026-44843 is a high-severity vulnerability in Langchain, classified under Deserialization of Untrusted Data. CVSS score: 8.2/10. Published 2026-05-26.
How severe is CVE-2026-44843?: High severity. CVSS v3 base score is 8.2 out of 10.