CVE-2026-25528 LangSmith Client SDK Affected by Server-Side Request Forgery via Tracing Header Injection

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. The LangSmith SDK's distributed tracing feature is vulnerable to Server-Side Request Forgery via malicious HTTP headers. An attacker can inject arbitrary apiurl values through the baggage header, causing the SDK to...

CVE-2026-25528

CVE-2026-25528 affects LangSmith Client SDKs with distributed tracing. The baggage header in HTTP requests could inject replica configurations (api_url/api_key), causing the SDK to send trace data to attacker-controlled endpoints via post()/patch() after a traced operation. Root cause: RunTree.fr...

CVE-2026-25528

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. The LangSmith SDK's distributed tracing feature is vulnerable to Server-Side Request Forgery via malicious HTTP headers. An attacker can inject arbitrary apiurl values through the baggage header, causing the SDK to...

PT-2026-7149

Name of the Vulnerable Software and Affected Versions LangSmith Client SDKs versions prior to 0.6.3 LangSmith Client SDKs versions prior to 0.4.6 Description The LangSmith SDK’s distributed tracing feature is susceptible to Server-Side Request Forgery SSRF through manipulation of HTTP headers. An...