CVE-2026-114386
MEDIUM
CVSS 4.8
Published: 2026-10-21
Modified: 2026-10-22
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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.
Quick Facts
| CVE ID | CVE-2026-114386 |
| CVSS Score | 4.8 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
| Published | 2026-10-21 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |
References
- https://github.com/pydantic/pydantic-ai/blob/v2.58.0/src/pyd…
- https://github.com/pydantic/pydantic-ai/commit/eb27b2b89fe76…
- https://github.com/pydantic/pydantic-ai/pull/10362
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.59.0
- https://pypi.org/project/pydantic-ai-harness/0.59.0/
- https://www.vulncheck.com/advisories/pydantic-ai-harness-bef…