Pydantic AI is a Python agent framework for building applications and workflows with Generative AI

Overview

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Package advisory (CVE-2026-107294)

Affected packages:

• pydantic-ai >= 1.77.0, < 1.107.2
• pydantic-ai >= 2.0.0b1, <= 2.23.0
• pydantic-ai-slim >= 1.77.0, < 1.107.2
• pydantic-ai-slim >= 2.0.0b1, <= 2.23.0

Patched in:

• pydantic-ai 1.107.2
• pydantic-ai 2.24.0
• pydantic-ai-slim 1.107.2
• pydantic-ai-slim 2.24.0

Source: https://github.com/advisories/GHSA-v2xh-2vp8-57h8