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CVE-2026-114386— Pydantic AI Harness before 0.59.0 CodeMode Tool Call Limit Bypass via run_code

Quick assessment

Affected

pydantic pydantic-ai-harness

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 0.59.0 版本之前的 Pydantic AI Harness 中，当通过 CodeMode 工具集中的函数分派嵌套工具调用时，系统无法强制执行限制。这导致用户或被提示注入（prompt-injected）的内容能够绕过检查，通过方法在沙箱程序中调用工具，从而超出操作员对高成本或具有副作用工具的使用限制。

CVSS 4.8 · Medium Updated Oct 21, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Pydantic AI Harness before 0.59.0 CodeMode Tool Call Limit Bypass via run_code

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

不加限制或调节的资源分配

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
pydantic	pydantic-ai-harness	0 ~ 0.59.0	-

II. Public POCs for CVE-2026-114386

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-114386

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Other References for CVE-2026-114386 (6)

https://github.com/pydantic/pydantic-ai/blob/v2.58.0/src/pydantic_ai_harness/pydantic_ai_harness/code_mode/_toolset.py#L642-L680 technical-description
https://github.com/pydantic/pydantic-ai/pull/10362 issue-tracking patch
https://pypi.org/project/pydantic-ai-harness/0.59.0/ product
https://github.com/pydantic/pydantic-ai/commit/eb27b2b89fe76ae23ee9b6fc9eb4b227a4967949 patch
https://github.com/pydantic/pydantic-ai/releases/tag/v2.59.0 release-notes
https://www.vulncheck.com/advisories/pydantic-ai-harness-before-0.59.0-codemode-tool-call-limit-bypass-via-run-code third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-114386

IV. Related Vulnerabilities

Same vendor: pydantic

Same weakness: CWE-770

V. Comments for CVE-2026-114386

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-114386— Pydantic AI Harness before 0.59.0 CodeMode Tool Call Limit Bypass via run_code

Quick assessment

Possible ATT&CK Techniques 2 AI

I. Basic Information for CVE-2026-114386

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-114386

III. Intelligence Information for CVE-2026-114386

Other References for CVE-2026-114386 (6)

IV. Related Vulnerabilities

V. Comments for CVE-2026-114386

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