Pydantic AI is a Python agent framework for building applications and workflows with Generative AI.
CVE-2026-107292
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 2.30.0, the Agent.toweb() and clai web development chat server does not validate the Host header, allowing a website visited by a developer to use DNS rebinding to reach a loopback-hosted agent as a same-origin service. The hostile page can read the served UI and submit chat requests that execute agent tools with the local process's privileges and credentials, causing data disclosure or unwanted side effects. Binding to localhost, Origin checks, and CSRF tokens do not prevent the same-origin DNS rebinding path. This issue is fixed in versions 1.107.5 and 2.30.0.
Part of the AI stack
This affects PydanticAI, in Agent frameworks.
Assessment
- CVSS
- 6.4 (v3.1)
- Severity
- Medium
- EPSS
- 0.13% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 8 October 2026
- Last updated
- 14 October 2026
- Affected
- Pydantic · pydantic-ai · pydantic-ai-slim
- Weakness
- CWE-346, CWE-350
- Assigner
- security-advisories@github.com
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
At the source
References
- https://github.com/pydantic/pydantic-ai/commit/394cc1d31656620704a703a2daed752afa5135fe
- https://github.com/pydantic/pydantic-ai/commit/871c7aeec5dfed2138655ccbccbf15c6d763bae7
- https://github.com/pydantic/pydantic-ai/pull/7437
- https://github.com/pydantic/pydantic-ai/pull/7438
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.5
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.30.0
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-q2xc-rrxj-58x9
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