What’s Vulnerable › Vulnerabilities

CVE-2026-34070: LangChain Core has Path Traversal vulnerabilites in legacy `load_prompt` functions

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-08-25
• Weakness: CWE-22

Description

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 products

• langchain-ai langchain: before 1.2.22 — fixed in 1.2.22

How to fix

Upgrade to a fixed version: langchain-ai langchain 1.2.22. Check the vendor advisory for mitigations.

References

• https://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47c
• https://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22
• https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54
• https://access.redhat.com/errata/RHSA-2026:24766
• https://access.redhat.com/errata/RHSA-2026:37275
• https://access.redhat.com/errata/RHSA-2026:59159
• https://access.redhat.com/security/cve/CVE-2026-34070
• https://bugzilla.redhat.com/show_bug.cgi?id=2453287
• https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34070.json

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