CVE-2026-44843: LangChain vulnerable to unsafe deserialization

# CVE-2026-44843: LangChain vulnerable to unsafe deserialization

https://gcdradar.vercel.app/incidents/cve-2026-44843-langchain-vulnerable-to-unsafe-deserializatio · AIR-2026-0630 · closed 2026-05-08

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-05-08
- AI role: Attack on AI
- Products: LangChain
- CVE ids: CVE-2026-44843
- CVSS: 8.2

## Summary

LangChain contains older runtime code paths that deserialize payloads using overly broad object allowlists. This enables attacker-supplied serialized constructor dictionaries to instantiate classes with untrusted arguments.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-05-26: CVE-2026-44843: LangChain is a framework for building agents and LLM-powered applications. (https://nvd.nist.gov/vuln/detail/CVE-2026-44843)
- 2026-05-08: CVE-2026-44843: LangChain vulnerable to unsafe deserialization of attacker-controlled objects through overly broad `load()` allowlists (https://github.com/advisories/GHSA-pjwx-r37v-7724)

## Sources

- 2026-05-08 GitHub Advisory Database: CVE-2026-44843: LangChain vulnerable to unsafe deserialization of attacker-controlled objects through overly broad `load()` allowlists https://github.com/advisories/GHSA-pjwx-r37v-7724
- 2026-05-26 NVD: CVE-2026-44843: LangChain is a framework for building agents and LLM-powered applications. https://nvd.nist.gov/vuln/detail/CVE-2026-44843

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.