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TI-2026-69612 Aliases CVE-2026-107292GHSA-q2xc-rrxj-58x9

DNS rebinding in Pydantic AI web chat lets sites reach local agents

Priority LOW 27CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Low · High · Low
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-346.

Summary

The Agent.to_web() and clai web chat server in pydantic-ai and pydantic-ai-slim from 1.34.0 before 1.107.5 and from 2.0.0b1 before 2.30.0 does not validate the Host header (CWE-346). A developer visiting a hostile website can let it use DNS rebinding to reach the loopback agent as a same-origin service. The page can submit chat requests that run agent tools with the local process's privileges, causing data disclosure or unwanted side effects.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00132 2nd percentileScored 2026-11-07
Fix Partial pydantic-ai (pydantic): 2.30.0pydantic-ai-slim (pydantic): 2.30.0+2 more productsRed Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pydanticpydantic-ai1.34.0 to before 2.0.0b1; 2.0.0b1 to before 2.30.02.30.0Patch availableCNA
pydanticpydantic-ai-slim1.34.0 to before 2.0.0b1; 2.0.0b1 to before 2.30.02.30.0Patch availableCNA
—pydantic-ai (PyPI)1.34.0 to before 1.107.51.107.5Patch availableGHSA-q2xc-rrxj-58x9
—pydantic-ai (PyPI)2.0.0b1 to before 2.30.02.30.0Patch availableGHSA-q2xc-rrxj-58x9
—pydantic-ai-slim (PyPI)1.34.0 to before 1.107.51.107.5Patch availableGHSA-q2xc-rrxj-58x9
—pydantic-ai-slim (PyPI)2.0.0b1 to before 2.30.02.30.0Patch availableGHSA-q2xc-rrxj-58x9
  • pydantic-ai Vendorpydantic Affected 1.34.0 to before 2.0.0b1; 2.0.0b1 to before 2.30.0 Fixed in 2.30.0 Patch available CNA
  • pydantic-ai-slim Vendorpydantic Affected 1.34.0 to before 2.0.0b1; 2.0.0b1 to before 2.30.0 Fixed in 2.30.0 Patch available CNA
  • pydantic-ai (PyPI) Vendor— Affected 1.34.0 to before 1.107.5 Fixed in 1.107.5 Patch available GHSA-q2xc-rrxj-58x9
  • pydantic-ai (PyPI) Vendor— Affected 2.0.0b1 to before 2.30.0 Fixed in 2.30.0 Patch available GHSA-q2xc-rrxj-58x9
  • pydantic-ai-slim (PyPI) Vendor— Affected 1.34.0 to before 1.107.5 Fixed in 1.107.5 Patch available GHSA-q2xc-rrxj-58x9
  • pydantic-ai-slim (PyPI) Vendor— Affected 2.0.0b1 to before 2.30.0 Fixed in 2.30.0 Patch available GHSA-q2xc-rrxj-58x9

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:*1.34.0 to before 1.107.5Vulnerablepydantic
cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:*2.0.0 to before 2.30.0Vulnerablepydantic
  • cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:* Versions 1.34.0 to before 1.107.5 Vulnerable ·pydantic
  • cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:* Versions 2.0.0 to before 2.30.0 Vulnerable ·pydantic

Remediation

Upgrade pydantic-ai and pydantic-ai-slim to version 1.107.5 or 2.30.0. Red Hat has no fix plan available for Lightspeed Core or Red Hat Enterprise Linux AI (RHEL AI) 3.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA pydantic-ai (pydantic) Fixed in 2.30.0
  • Fix · CNA pydantic-ai-slim (pydantic) Fixed in 2.30.0
  • Fix · GHSA-q2xc-rrxj-58x9 pydantic-ai (PyPI) Fixed in 1.107.5 Advisory →
  • Fix · GHSA-q2xc-rrxj-58x9 pydantic-ai (PyPI) Fixed in 2.30.0 Advisory →
  • Fix · GHSA-q2xc-rrxj-58x9 pydantic-ai-slim (PyPI) Fixed in 1.107.5 Advisory →
  • Fix · GHSA-q2xc-rrxj-58x9 pydantic-ai-slim (PyPI) Fixed in 2.30.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Lightspeed CoreAffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-08 Threatist record created from CVE-2026-107292
  2. 2026-10-08 Alias added: GHSA-q2xc-rrxj-58x9
  3. 2026-10-09 Affected versions changed · Red Hat
  4. 2026-10-09 CVSS score added · Red Hat
  5. 2026-10-10 Priority changed: MEDIUM → LOW
  6. 2026-10-14 CISA SSVC decision points changed

References

Patch 6

Advisory 1

Other 1

  • TI-2026-20687 Pydantic AI Affected by Server-Side Request Forgery (SSRF) in URL Download Handling CVSS 3.1HIGH 8.6
  • TI-2026-69551 Pydantic AI keeps concurrency slots after streams end early CVSS 3.1HIGH 7.5
  • TI-2026-46990 Incorrect authorization in pydantic-ai CVSS 3.1MEDIUM 6.5
  • TI-2026-69610 Cross-site requests run agent tools in pydantic-ai web chat CVSS 3.1HIGH 7.6
  • TI-2026-20740 Pydantic AI affected by Stored XSS via Path Traversal in Web UI CDN URL CVSS 3.1HIGH 7.1
  • TI-2026-69617 Pydantic AI blocklist bypass via IPv6 zone identifier allows SSRF CVSS 3.1MEDIUM 6.8
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences