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CVE-2026-34070

LangChain Core path traversal

7.5 HIGHPublic exploitEPSS 1.21%
  1. Published31 Mar 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

LangChain Core< 1.2.22

Remediation

Fixed in
LangChain Core≥ 1.2.22

References

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Frequently asked

Is CVE-2026-34070 being actively exploited?

CVE-2026-34070 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.21%.

How severe is CVE-2026-34070?

CVE-2026-34070 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 1.21% probability of exploitation.

Which products are affected by CVE-2026-34070?

Affected products include LangChain Core.

How do I fix CVE-2026-34070?

Upgrade affected software to a fixed version, for example LangChain Core 1.2.22 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34070 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.