CVE-2026-45134
LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. Prior to LangSmith SDK Python 0.8.0 and JS/TS 0.6.0, the LangSmith SDK's prompt pull methods (pull_prompt / pull_prompt_commit 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. This vulnerability is fixed in LangSmith SDK Python 0.8.0 and JS/TS 0.6.0.
- CVSS 3.1
- 7.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N - EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-25)
- CWE
- CWE-502
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3644-q5cj-c5c7 | PyPI | langsmith | <0.8.0 | 0.8.0 |
| GHSA-3644-q5cj-c5c7 | npm | langsmith | <0.6.0 | 0.6.0 |
| GHSA-3644-q5cj-c5c7 | PyPI | langchain-classic | <1.0.7 | 1.0.7 |
| GHSA-3644-q5cj-c5c7 | PyPI | langchain | <0.3.30 | 0.3.30 |
| PYSEC-2026-2555 | PyPI | langchain | <0.3.30 | 0.3.30 |
| PYSEC-2026-2560 | PyPI | langchain-classic | <1.0.7 | 1.0.7 |
| PYSEC-2026-2582 | PyPI | langsmith | <0.8.0 | 0.8.0 |