Pydantic AI Harness up to 0.58.x CodeMode run_nested_call tool_calls_limit privileges management

Summaryinfo

A vulnerability categorized as critical has been discovered in Pydantic AI Harness up to 0.58.x. The affected element is the function run_nested_call of the component CodeMode. The manipulation of the argument tool_calls_limit results in privileges management. This vulnerability is reported as CVE-2026-114386. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Pydantic AI Harness up to 0.58.x. Affected is the function run_nested_call of the component CodeMode. The manipulation of the argument tool_calls_limit with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-114386 since 10/21/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 0.59.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Pydantic

Name

• AI Harness

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.38
• 0.39
• 0.40
• 0.41
• 0.42
• 0.43
• 0.44
• 0.45
• 0.46
• 0.47
• 0.48
• 0.49
• 0.50
• 0.51
• 0.52
• 0.53
• 0.54
• 0.55
• 0.56
• 0.57
• 0.58

CPE 2.3info

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CPE 2.2info

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