CVE-2026-107288 Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local webfetchtool and the WebFetch local fallback compare blockeddomains entries with a URL hostname before both values are normalized to the form used by...

CVE-2026-107288 Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local webfetchtool and the WebFetch local fallback compare blockeddomains entries with a URL hostname before both values are normalized to the form used by...

CVE-2026-107288 Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes differently

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local webfetchtool and the WebFetch local fallback compare blockeddomains entries with a URL hostname before both values are normalized to the form used by...

CVE-2026-107288

The Pydantic AI Python agent framework versions 1.77.0 through 1.107.6 and 2.44.0 are vulnerable to a Server-Side Request Forgery (SSRF) . The root cause is that the web_fetch_tool and WebFetch local fallback compare blocked_domains entries against a URL hostname before both values are normalized...