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Sunday, 13 September 2026
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Incident database

LangChain SSRF redirect bypass and LangSmith Studio token-leak vulnerabilities

Two LangChain vulnerabilities were disclosed and patched: a redirect-based SSRF bypass in RecursiveUrlLoader in @langchain/community (CVE-2026-27795), which allowed a validated public URL to redirect to internal or metadata endpoints, and a URL parameter injection flaw in LangSmith Studio (CVE-2026-25750) that leaked bearer tokens, user IDs and workspace IDs to attacker-controlled servers when users clicked crafted links.

Disclosed 25 February 2026 · Record updated 13 September 2026

Impact

SSRF bypass could let a request reach internal or cloud metadata endpoints; the LangSmith Studio flaw could let an attacker steal a short-lived bearer token and impersonate an authenticated user across LangSmith Cloud and self-hosted workspaces.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-27795
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-25750