CVE-2026-114386
Pydantic AI Harness before 0.59.0 CodeMode Tool Call Limit Bypass via run_code
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 21, 2026
- Updated
- Oct 21, 2026
- Reserved
- Oct 21, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L | VulnCheck |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
pydantic-ai-harnesspydantic |
|
References
- https://github.com/pydantic/pydantic-ai/pull/10362issue-trackingpatch
- https://github.com/pydantic/pydantic-ai/commit/eb27b2b89fe76ae23ee9b6fc9eb4b227a4967949patch
- pydantic-ai-harness v2.59.0 Release Notesrelease-notes
- https://github.com/pydantic/pydantic-ai/blob/v2.58.0/src/pydantic_ai_harness/pydantic_ai_harness/code_mode/_toolset.py#L642-L680technical-description
- https://pypi.org/project/pydantic-ai-harness/0.59.0/product
- VulnCheck Advisory: Pydantic AI Harness before 0.59.0 CodeMode Tool Call Limit Bypass via run_codethird-party-advisory
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