CVE-2026-34070: LangChain Core Has Path Traversal Vulnerabilities in load_prompt

# CVE-2026-34070: LangChain Core Has Path Traversal Vulnerabilities in load_prompt

https://gcdradar.vercel.app/incidents/cve-2026-34070-langchain-core-has-path-traversal-vulnerabili · AIR-2026-0522 · closed 2026-03-27

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-03-27
- AI role: Attack on AI
- Products: LangChain, langchain_core
- CVE ids: CVE-2026-34070
- CVSS: 7.5

## Summary

Path traversal vulnerabilities in legacy LangChain Core load_prompt functions allow reading arbitrary files. Applications passing user-influenced prompt configurations risk host file system exposure.

## What to do

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

## Latest updates

- 2026-03-31: CVE-2026-34070: LangChain is a framework for building agents and LLM-powered applications. (https://nvd.nist.gov/vuln/detail/CVE-2026-34070)
- 2026-03-27: CVE-2026-34070: LangChain Core has Path Traversal vulnerabilites in legacy `load_prompt` functions (https://github.com/advisories/GHSA-qh6h-p6c9-ff54)

## Sources

- 2026-03-27 GitHub Advisory Database: CVE-2026-34070: LangChain Core has Path Traversal vulnerabilites in legacy `load_prompt` functions https://github.com/advisories/GHSA-qh6h-p6c9-ff54
- 2026-03-31 NVD: CVE-2026-34070: LangChain is a framework for building agents and LLM-powered applications. https://nvd.nist.gov/vuln/detail/CVE-2026-34070

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