CVE-2026-107294 · GHSA-v2xh-2vp8-57h8
Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl
- Risk score
- 51/100
- CVSS
- 6.5 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 8 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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…
- Affected
- pydantic-ai (pip) >= 1.77.0, < 1.107.2; pydantic-ai (pip) >= 2.0.0b1, <= 2.23.0; pydantic-ai-slim (pip) >= 1.77.0, < 1.107.2; pydantic-ai-slim (pip) >= 2.0.0b1, <= 2.23.0
- Fix
- Upgrade pydantic-ai to 1.107.2 or 2.24.0; pydantic-ai-slim to 1.107.2 or 2.24.0 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 6.5 medium
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| pydantic-ai | pip | >= 1.77.0, < 1.107.2 | 1.107.2 |
| pydantic-ai | pip | >= 2.0.0b1, <= 2.23.0 | 2.24.0 |
| pydantic-ai-slim | pip | >= 1.77.0, < 1.107.2 | 1.107.2 |
| pydantic-ai-slim | pip | >= 2.0.0b1, <= 2.23.0 | 2.24.0 |
References
- https://github.com/advisories/GHSA-v2xh-2vp8-57h8
- 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
- https://github.com/advisories/GHSA-v2xh-2vp8-57h8
Original 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.
Last activity 8 Oct 2026. Patch Forecast updates every hour.