Disclosure summary
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.
Source-reported weakness categories
CWE-400
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-107294
Open original source · Updated Oct 09, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
GitHub Reviewed Security Advisories · GHSA-v2xh-2vp8-57h8
Open original source · Updated Oct 08, 2026
Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl
Source severity: MEDIUM / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| pip | pydantic-ai | >= 1.77.0, < 1.107.2 | 1.107.2 |
| pip | pydantic-ai | >= 2.0.0b1, | 2.24.0 |
| pip | pydantic-ai-slim | >= 1.77.0, < 1.107.2 | 1.107.2 |
| pip | pydantic-ai-slim | >= 2.0.0b1, | 2.24.0 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com
- github.com
- github.com
- github.com
- github.com
- github.com
- github.com
PUBLISHED 2026-10-08T13:17:15-04:00
MODIFIED 2026-10-09T12:17:21-04:00
INGESTED 2026-10-10T20:55:03-04:00