LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. Prior to 0.8.18, an attacker who can send an HTTP request to a server running the LangSmith SDK's TracingMiddleware can cause that server to read an arbitrary file from its local filesystem and upload the contents to LangSmith as a trace attachment. Depending on how the distributed trace system is deployed, triggering a read may not require authentication. Retrieving the contents requires read access to the LangSmith workspace the traces are sent to. The net effect is a trust-boundary crossing: a party with workspace trace-read access (for example a low-privilege workspace member, a contractor, or a compromised teammate account) gains the ability to read files from any server running TracingMiddleware, a capability outside that workspace's intended trust boundary. This vulnerability is fixed in 0.8.18.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 10 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 07 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 06 Jul 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Langchain-ai
Langchain-ai langsmith-sdk
Vendors & Products Langchain-ai
Langchain-ai langsmith-sdk

Mon, 06 Jul 2026 15:45:00 +0000

Type Values Removed Values Added
Description LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. Prior to 0.8.18, an attacker who can send an HTTP request to a server running the LangSmith SDK's TracingMiddleware can cause that server to read an arbitrary file from its local filesystem and upload the contents to LangSmith as a trace attachment. Depending on how the distributed trace system is deployed, triggering a read may not require authentication. Retrieving the contents requires read access to the LangSmith workspace the traces are sent to. The net effect is a trust-boundary crossing: a party with workspace trace-read access (for example a low-privilege workspace member, a contractor, or a compromised teammate account) gains the ability to read files from any server running TracingMiddleware, a capability outside that workspace's intended trust boundary. This vulnerability is fixed in 0.8.18.
Title Arbitrary server-side file read in LangSmith SDK TracingMiddleware
Weaknesses CWE-22
CWE-346
CWE-843
References
Metrics cvssV3_1

{'score': 5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-07T15:17:40.993Z

Reserved: 2026-07-02T16:50:27.886Z

Link: CVE-2026-59152

cve-icon Vulnrichment

Updated: 2026-07-07T15:17:36.796Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-07-06T16:16:37.413

Modified: 2026-07-07T16:16:41.340

Link: CVE-2026-59152

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-06T14:26:55Z

Links: CVE-2026-59152 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-01T18:45:03Z

Weaknesses