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

Pydantic AI framework patches path traversal XSS and SSRF vulnerabilities

Two vulnerabilities were disclosed in the Pydantic AI Python agent framework: a path traversal flaw in the web UI (CVE-2026-25640) that lets a crafted URL serve attacker-controlled JavaScript and steal chat history, and an SSRF flaw in URL download functionality (CVE-2026-25580) that can make the server request internal network resources. Both are fixed in versions 1.51.0 and 1.56.0 respectively.

Disclosed 6 February 2026 · Record updated 13 September 2026

Impact

Path traversal in the Agent.to_web/clai web chat interface allows execution of attacker-controlled JavaScript in a victim's browser, enabling theft of chat history and other client-side data; the SSRF flaw allows servers accepting untrusted message history to be forced to request internal services or cloud credentials.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-25640
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-25580