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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

LangChain SSRF protection bypasses in langchain-text-splitters and langchain-openai

Two vulnerabilities in LangChain packages allowed SSRF protections to be bypassed: HTMLHeaderTextSplitter.split_text_from_url() followed unvalidated redirects (CVE-2026-41481), and langchain-openai's _url_to_size() helper was subject to a TOCTOU/DNS rebinding window (CVE-2026-41488), potentially allowing requests to internal, localhost or cloud metadata endpoints and leaking internal data to callers.

Disclosed 24 April 2026 · Record updated 13 September 2026

Impact

Attacker-supplied URLs could reach internal, localhost or cloud metadata endpoints; depending on the application, content from those internal endpoints could be returned to the requester as Document objects, enabling data exfiltration.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-41481
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-41488