Server-Side Request Forgery (SSRF) in langsmith-sdk - CVE-2026-25528
Published: March 6, 2026
Vulnerability identifier: #VU123613
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-25528
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LangChain
Affected software:
langsmith-sdk
langsmith-sdk
Detailed vulnerability description
The disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can inject arbitrary api_url values through the baggage header, causing the SDK to exfiltrate sensitive trace data to attacker-controlled endpoints.
How to mitigate CVE-2026-25528
Install updates from vendor's website.