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GHSA-5jjj-9xc3-rm56

HighCVSS 7.8 / 10
Published Oct 7, 2026·Last modified Oct 7, 2026
Affected Components(7)
PyPI logohydra-optuna-sweeper
1.4.0.dev5
PyPI logohydra-optuna-sweeper
1.4.0.dev7
PyPI logohydra-optuna-sweeper
1.4.0.dev9
1 / 3
Description

Summary

hydra-optuna-sweeper accepted a configuration-controlled dotted path in hydra.sweeper.custom_search_space, resolved it with the lower-level hydra.utils.get_method() API, and later invoked the returned callable.

Hydra's object-lookup helpers intentionally trust their input and do not apply the execution policy used by instantiate() and logging configuration. As a result, untrusted Optuna multirun configuration could select installed Python code for execution in the Hydra controller process.

Impact

Exploitation requires control of an application's Optuna sweep configuration or command-line overrides and an importable callable in the application's environment. Selected code runs with the privileges of the application.

On affected Hydra 1.4 development releases, this path bypasses an execution whitelist provided by trusted application code. Hydra 1.3 has no execution-whitelist security boundary; there, the same change restores the legacy blocklist as defense in depth.

Fix

The Optuna sweeper now resolves the configured callback through hydra.utils.instantiate() as a partial callable. On Hydra 1.4, the active execution whitelist therefore authorizes the callback before use. On Hydra 1.3, the legacy blocklist is applied as defense in depth.

The public get_object(), get_method(), get_static_method(), and get_class() helpers remain lower-level trusted-input APIs. Their documentation now warns against passing values derived from untrusted configuration and directs config-driven construction to instantiate().

Affected versions

  • Package: hydra-optuna-sweeper
  • Stable affected range: >= 1.2.0, < 1.3.0
  • Stable fixed version: 1.3.0
  • Development affected range: >= 1.4.0.dev4, < 1.4.0.dev10
  • Development fixed version: 1.4.0.dev10

The feature was introduced in 1.2.0 and is absent from the 1.1 release line. The 1.4 development line was affected from 1.4.0.dev4 through 1.4.0.dev9.

Workaround

Treat Optuna sweep configuration and command-line overrides as trusted. Do not set custom_search_space from externally controlled input or allow untrusted users to place modules on the application import path.

Reported by zx (GitHub: @manus-pi).

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Risk Scores
Base Score
7.8

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
7.1

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-106440
    Alias
  • EUVD-2026-93661
    Alias

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