CVE-2026-34070

Summary

LangChain is a framework for building agents and LLM-powered applications. Prior to version 1.2.22, multiple functions in langchain_core.prompts.loading read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to load_prompt() or load_prompt_from_config(), an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (.txt for templates, .json/.yaml for examples). This issue has been patched in version 1.2.22.

Affected Software

Weaknesses

• CWE-22: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54

langchain: path traversal in legacy load_prompt functions in langchain-core

Additional References

• https://access.redhat.com/security/cve/CVE-2026-34070
• https://bugzilla.redhat.com/show_bug.cgi?id=2453287
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34070.json
• https://access.redhat.com/errata/RHSA-2026:24766

References

• https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54
• https://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47c
• https://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22

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