Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The LangSmith SDK (langsmith, PyPI) versions before 0.8.18 are affected. An attacker who can send HTTP requests to a server running TracingMiddleware can make that server read an arbitrary local file and upload it as a trace attachment. The attacker then needs read access to the destination LangSmith workspace, such as a workspace member, to retrieve the contents. Upgrade langsmith to 0.8.18 or later. Until then, do not expose TracingMiddleware to untrusted HTTP traffic and limit workspace trace-read access to trusted members.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.0 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0020, the 9th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:29 UTC First seen by agentprime
- 31 Oct 2026, 14:29 UTC Confirmed by OSV