CVE-2026-59152 - Arbitrary server-side file read in LangSmith SDK TracingMiddleware

CVE-2026-59152 - Arbitrary server-side file read in LangSmith SDK TracingMiddleware

https://cvefeed.io/rssfeed/latest.atom / Mon, 07/06/2026 - 19:04
CVE ID :CVE-2026-59152
Published : July 6, 2026, 4:16 p.m. | 28 minutes ago
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.
Severity: 5.0 | MEDIUM
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