LangSmith SDK TracingMiddleware: Arbitrary server-side file read — GHSA-F4XH-W4CJ-QXQ8

Summary

# Summary 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…

Timeline

Published by source

2026-06-20

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 7.7 out of 10.
• Reported EPSS value: 0.
• Review exposure for the affected product or family: pip: langsmith.

Product

pip: langsmith

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source

Evidence and provenance

Canonical advisory ID

GHSA-F4XH-W4CJ-QXQ8

Source

GitHub

Vendor

GitHub

Published by source

2026-06-20

Last source activity

2026-06-20

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.