CVE-2026-107292Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): the local chat endpoint does not validate the `Host` header
Updated under an hour ago ()
Does this affect you?
It affects pydantic-ai and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.to_web() 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.
- CVSS
- 6.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
- Weakness (CWE)
- CWE-346, CWE-350
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
pydantic pydantic-ai pydantic:ai (from the name) | from 1.34.0, < 2.0.0b1; from 2.0.0b1, < 2.30.0 | CNA record |
pydantic pydantic-ai-slim pydantic:ai_slim (from the name) | from 1.34.0, < 2.0.0b1; from 2.0.0b1, < 2.30.0 | CNA record |
pydantic pydantic_ai pydantic:pydantic_ai | from 1.34.0 before 1.107.5; from 2.0.0 before 2.30.0 | NVD |
References
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-q2xc-rrxj-58x9x-refsource-confirm, vendor-advisory
- https://github.com/pydantic/pydantic-ai/pull/7437x-refsource-misc, patch, vendor-advisory
- https://github.com/pydantic/pydantic-ai/pull/7438x-refsource-misc, patch, vendor-advisory
- https://github.com/pydantic/pydantic-ai/commit/394cc1d31656620704a703a2daed752afa5135fex-refsource-misc, patch
- https://github.com/pydantic/pydantic-ai/commit/871c7aeec5dfed2138655ccbccbf15c6d763bae7x-refsource-misc, patch
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.5x-refsource-misc, patch, release-notes, vendor-advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.30.0x-refsource-misc, patch, release-notes, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.