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Vulnerability record · CVE-2026-34070 · published 31 March 2026

CVE-2026-34070: Langchain core path traversal vulnerability

Langchain · Langchain Core

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.

7.5 CVSS 3.1 High EPSS 1.2% · top 32.7% CWE-22 · Path traversal
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
25 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47c Patch
https://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22 Release Notes
https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54 ExploitVendor Advisory
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 ExploitVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34070.json

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Source: NIST National Vulnerability Database (record CVE-2026-34070), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.