CVE-2026-34070

Name: CVE-2026-34070
Creator: NVD / NIST
Published: 2026-03-31T03:15:58.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.07%

Last modified Jun 17, 2026

CVE-2026-34070 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.07% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.07%

60.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Langchain	Langchain Core	< 1.2.22

References

https://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47cPatch
https://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22Release Notes
https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54Exploit, Vendor Advisory
https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54Exploit, Vendor Advisory

Timeline

Published: Mar 31, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34070?

How severe is CVE-2026-34070?

CVE-2026-34070 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.07% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34070?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34070?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST