Cloudanix VulnDB

CVE-2026-25528

Medium · 5.8

CVSS

5.8

EPSS

0.4%

Published

Feb 9, 2026

CISA due date

—

The record

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 api_url values through the baggage header, causing the SDK to exfiltrate sensitive trace data to attacker-controlled endpoints. When using distributed tracing, the SDK parses incoming HTTP headers via RunTree.from_headers() in Python or RunTree.fromHeaders() in Typescript. The baggage header can contain replica configurations including api_url and api_key fields. Prior to the fix, these attacker-controlled values were accepted without validation. When a traced operation completes, the SDK's post() and patch() methods send run data to all configured replica URLs, including any injected by an attacker. This vulnerability is fixed in version 0.6.3 of the Python SDK and 0.4.6 of the JavaScript SDK.

Affected packages

Ecosystem Package Introduced Fixed
PyPI langsmith 0.4.10 0.6.3
npm langsmith 0.3.41 0.4.6
Chainguard kibana-8.17 0 8.17.10-r10
Chainguard kibana-8.17-iamguarded 0 8.17.10-r10
Chainguard kibana-9.0 0 9.0.8-r10
Chainguard kibana-9.0-bitnami 0 9.0.8-r10
Chainguard kibana-9.0-iamguarded 0 9.0.8-r10
Chainguard kibana-9.2 0 9.2.5-r4
Chainguard kibana-9.2-iamguarded 0 9.2.5-r4
Chainguard kibana-9.3 0 9.3.0-r2
Chainguard kibana-9.3-iamguarded 0 9.3.0-r2
Chainguard langfuse-2-worker 0 2.95.12-r11
Chainguard langfuse-3-worker 0 3.153.0-r2
Chainguard langfuse-fips-2-worker 0 2.95.12-r12
Chainguard langfuse-fips-3-worker 0 3.153.0-r1
Chainguard librechat 0 0.8.3-r0
Wolfi langfuse-3-worker 0 3.153.0-r2

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