Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
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 … https://www.cve.org/CVERecord?id=CVE-2026-25528
Post summary
The text announces CVE‑2026‑25528 as an SSRF vulnerability in the LangSmith SDK’s distributed tracing, without mentioning PoCs, exploits, or patches.
CVE-2026-25528: The Tattletale Header: SSRF in LangSmith SDK A Server-Side Request Forgery (SSRF) vulnerability in the LangSmith SDK (Python and JS) allows attackers to exfiltrate sensitive LLM traces, including prompts and completions, by injecting a... https://cvereports.com/reports/CVE-2026-25528
Post summary
A Server‑Side Request Forgery vulnerability in the LangSmith SDK allows attackers to exfiltrate sensitive LLM traces, such as prompts and completions.