pydantic/pydantic-ai · Security
Pydantic AI Harness tool-call limit bypass in nested CodeMode calls
- GHSA ID
- GHSA-3589-pxp7-3gj8
- CVE ID
- CVE-2026-114386
- Severity
- medium
- Published
- Updated
- CVSS
- 4.8 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
- CVSS v3
- 4.8 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
- CVSS v4
- 6.3 · 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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.
CWEs
- CWE-770 · Allocation of Resources Without Limits or Throttling
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-114386 ↗
- https://github.com/pydantic/pydantic-ai/pull/10362 ↗
- https://github.com/pydantic/pydantic-ai/commit/eb27b2b89fe76ae23ee9b6fc9eb4b227a4967949 ↗
- https://github.com/pydantic/pydantic-ai/blob/v2.58.0/src/pydantic_ai_harness/pydantic_ai_harness/code_mode/_toolset.py#L642-L680 ↗
- 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-before-0.59.0-codemode-tool-call-limit-bypass-via-run-code ↗
- https://github.com/advisories/GHSA-3589-pxp7-3gj8 ↗