Medium severity4.8NVD Advisory· Published Oct 21, 2026
CVE-2026-114386
CVE-2026-114386
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: <0.59.0
Patches
Vulnerability mechanics
References
6- github.com/pydantic/pydantic-ai/blob/v2.58.0/src/pydantic_ai_harness/pydantic_ai_harness/code_mode/_toolset.pynvd
- github.com/pydantic/pydantic-ai/commit/eb27b2b89fe76ae23ee9b6fc9eb4b227a4967949nvd
- github.com/pydantic/pydantic-ai/pull/10362nvd
- github.com/pydantic/pydantic-ai/releases/tag/v2.59.0nvd
- pypi.org/project/pydantic-ai-harness/0.59.0/nvd
- www.vulncheck.com/advisories/pydantic-ai-harness-before-0.59.0-codemode-tool-call-limit-bypass-via-run-codenvd
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