CVE-2026-107295 Pydantic AI - Broken Access Control

Pydantic AI 1.34.0 to <1.107.4 and 2.28.0 contains a broken access control caused by missing request content-type validation in Agent.to_web() and clai chat endpoint, letting remote attackers execute tools with local process privileges, exploit requires attacker to submit crafted browser-compatible requests to loopback-hosted chat server.

CVSS base score 7.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-352

Vendor fix

Upgrade to versions 1.107.4 or 2.28.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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