---
id: CVE-2026-107295
title: >-
  Pydantic AI is a Python agent framework for building applications and
  workflows with Generative AI
summary: >-
  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 validati…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L'
cwe:
  - CWE-352
  - CWE-346
vendor: pydantic
product: pydantic-ai
affected:
  - 'pydantic-ai >= 1.34.0, < 1.107.4'
  - 'pydantic-ai >= 2.0.0b1, < 2.28.0'
  - 'pydantic-ai-slim >= 1.34.0, < 1.107.4'
  - 'pydantic-ai-slim >= 2.0.0b1, < 2.28.0'
patched:
  - pydantic-ai 1.107.4
  - pydantic-ai 2.28.0
  - pydantic-ai-slim 1.107.4
  - pydantic-ai-slim 2.28.0
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T20:35:31.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107295'
references:
  - url: >-
      https://github.com/pydantic/pydantic-ai/commit/d2690201a1834005d382dbf5c47e0ed94ef8bf46
    label: security-advisories@github.com
  - url: >-
      https://github.com/pydantic/pydantic-ai/commit/dd2abbdfa029c9ad138e7cc0edd2eaeaf9ed69c0
    label: security-advisories@github.com
  - url: 'https://github.com/pydantic/pydantic-ai/pull/7382'
    label: security-advisories@github.com
  - url: 'https://github.com/pydantic/pydantic-ai/pull/7383'
    label: security-advisories@github.com
  - url: 'https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.4'
    label: security-advisories@github.com
  - url: 'https://github.com/pydantic/pydantic-ai/releases/tag/v2.28.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-h4xc-3qfq-jf93
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-h4xc-3qfq-jf93'
tags:
  - nvd
  - cve.org
  - ghsa
  - pip
aliases:
  - GHSA-h4xc-3qfq-jf93
ecosystem: pip
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-08T17:53:16.989703Z'
ingestedAt: '2026-10-08T17:56:11.714Z'
---

## Overview

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.

## Remediation

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

## Package advisory (CVE-2026-107295)

Affected packages:

- `pydantic-ai >= 1.34.0, < 1.107.4`
- `pydantic-ai >= 2.0.0b1, < 2.28.0`
- `pydantic-ai-slim >= 1.34.0, < 1.107.4`
- `pydantic-ai-slim >= 2.0.0b1, < 2.28.0`

Patched in:

- `pydantic-ai 1.107.4`
- `pydantic-ai 2.28.0`
- `pydantic-ai-slim 1.107.4`
- `pydantic-ai-slim 2.28.0`

Source: https://github.com/advisories/GHSA-h4xc-3qfq-jf93