CVE-2026-107295 · GHSA-h4xc-3qfq-jf93
Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): a website visited by the developer can trigger agent runs and server-side tool execution on the local chat endpoint
- Risk score
- 56/100
- CVSS
- 7.6 v3.1
- Exploit chance (30 days)
- 0.2%
- 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 1.34.0 until 1.107.4 and 2.28.0, the Agent.to_web() and clai web development chat endpoint has missing request content-type validation. A website visited by a developer can submit a browser-compatible request to a …
- Affected
- pydantic-ai (pip) >= 1.34.0, < 1.107.4; pydantic-ai (pip) >= 2.0.0b1, < 2.28.0; pydantic-ai-slim (pip) >= 1.34.0, < 1.107.4; pydantic-ai-slim (pip) >= 2.0.0b1, < 2.28.0
- Fix
- Upgrade pydantic-ai to 1.107.4 or 2.28.0; pydantic-ai-slim to 1.107.4 or 2.28.0 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.6 high
- Remotely exploitable without logging in
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| pydantic-ai | pip | >= 1.34.0, < 1.107.4 | 1.107.4 |
| pydantic-ai | pip | >= 2.0.0b1, < 2.28.0 | 2.28.0 |
| pydantic-ai-slim | pip | >= 1.34.0, < 1.107.4 | 1.107.4 |
| pydantic-ai-slim | pip | >= 2.0.0b1, < 2.28.0 | 2.28.0 |
References
- https://github.com/advisories/GHSA-h4xc-3qfq-jf93
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-h4xc-3qfq-jf93
- https://github.com/pydantic/pydantic-ai/pull/7382
- https://github.com/pydantic/pydantic-ai/pull/7383
- https://github.com/pydantic/pydantic-ai/commit/d2690201a1834005d382dbf5c47e0ed94ef8bf46
- https://github.com/pydantic/pydantic-ai/commit/dd2abbdfa029c9ad138e7cc0edd2eaeaf9ed69c0
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.4
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.28.0
- https://github.com/advisories/GHSA-h4xc-3qfq-jf93
Original description
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 1.107.4 and 2.28.0, the Agent.to_web() and clai web development chat endpoint has missing request content-type validation. A website visited by a developer can submit a browser-compatible request to a loopback-hosted chat server, causing the served agent to run and execute tools with the privileges and credentials of the local process; client-relayed approval decisions also leave requires_approval=True tools exposed. Binding to localhost does not prevent a browser page from reaching the loopback address. This issue is fixed in versions 1.107.4 and 2.28.0.
Last activity 8 Oct 2026. Patch Forecast updates every hour.