CVE-2026-114386

Medium

Description

Pydantic AI Harness before 0.59.0 fails to enforce UsageLimits.tool_calls_limit on nested tool calls dispatched from run_code in the CodeMode toolset. Users or prompt-injected content can make the sandboxed program invoke tools via run_nested_call() without check_before_tool_call, exceeding operator limits on costly or side-effecting tools.

SeverityMedium

CVSS4.8

Exploit probability—

ProductPydantic-ai-harness

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

pydantic-ai-harness0.59.0 or later

Patches

Vendor advisories

github.com/pydantic/pydantic-ai/releases/tag/v2.59.0

Affected products

Product	Affected versions	Fixed in
pydantic-ai-harnessPyPI	v < 0.59.0	0.59.0

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