CVE-2026-114386
Pydantic AI Harness before 0.59.0 CodeMode Tool Call Limit Bypass via run_code
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | pydantic |
| Product | pydantic-ai-harness |
| Published | Oct 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
pydantic / pydantic-ai-harness
0 < 0.59.0
References
github.com: https://github.com/pydantic/pydantic-ai/pull/10362 github.com: https://github.com/pydantic/pydantic-ai/commit/eb27b2b89fe76ae23ee9b6fc9eb4b227a4967949 github.com: https://github.com/pydantic/pydantic-ai/releases/tag/v2.59.0 github.com: https://github.com/pydantic/pydantic-ai/blob/v2.58.0/src/pydantic_ai_harness/pydantic_ai_harness/code_mode/_toolset.py#L642-L680 pypi.org: https://pypi.org/project/pydantic-ai-harness/0.59.0/ vulncheck.com: https://www.vulncheck.com/advisories/pydantic-ai-harness-before-0.59.0-codemode-tool-call-limit-bypass-via-run-code
Credits
CBF