Is there a public exploit for CVE-2026-45134?

No public exploit for CVE-2026-45134 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-45134?

CVE-2026-45134 scores CVSS 7.1 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.2%.

What does CVE-2026-45134 affect?

CVE-2026-45134 affects langchain-ai langsmith, langchain-classic, langchain. It is part of the AI and agent stack (LangChain).

7.1 High

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform.

CVE-2026-45134

Description The LangSmith SDK's prompt pull methods (pullprompt / pullpromptcommit in Python, pullPrompt / pullPromptCommit in JS/TS) fetch and deserialize prompt manifests from the LangSmith Hub. These manifests may contain serialized LangChain objects and model configuration that affect runtime behavior. When pulling a public prompt by owner/name identifier, the manifest content is controlled by an external party, but prior versions of the SDK did not distinguish this from pulling a prompt within the caller's own organization. Prompt manifests can intentionally configure a model with a custom base URL, default headers, model name, or other constructor arguments. These are supported features, but they also mean the prompt contents should be treated as executable configuration rather than plain text. A prompt can also include serialized LangChain Runnable or PromptTemplate objects with attacker-controlled constructor kwargs, or secret references that, if secretsfromenv is enabled, read environment variables at deserialization time. Applications are exposed when all of the following are true: The application calls pullprompt or pullpromptcommit (Python) or pullPrompt or…

Part of the AI stack

This affects LangChain, in Agent frameworks.

Assessment

CVSS: 7.1 (v3.1)
Severity: High
EPSS: 0.2% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 May 2026
Last updated: 26 October 2026
Affected: langchain-ai · langsmith-sdk · langsmith · langsmith · langchain-classic · langchain
Weakness: CWE-502
Assigner: security-advisories@github.com

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

At the source

References

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