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[ CVE-2026-106440 · Published 6 Oct 2026 ]

Hydra: Optuna custom_search_space can resolve and execute untrusted callables via get_method

CVSS 7.8 EPSS <1%Fix available

[ Description ]Official description

Hydra is a framework for elegantly configuring complex applications. From 1.2.0 until 1.3.0 and 1.4.0.dev10, the hydra-optuna-sweeper package accepts a configuration-controlled dotted path in hydra.sweeper.custom_search_space, resolves it with hydra.utils.get_method(), and later invokes the returned callable in the Hydra controller process. Because get_method() is a trusted-input lookup helper and does not apply the execution policy used by instantiate(), an attacker who controls Optuna sweep configuration or command-line overrides can select importable Python code for execution with the application's privileges, including bypassing a trusted execution whitelist on affected Hydra 1.4 development releases. This issue is fixed in versions 1.3.0 and 1.4.0.dev10.

[ Fixes ]Fixes and patches

  • hydra-optuna-sweeper 1.3.0Fixed version · GitHub Advisories · pip package hydra-optuna-sweeper: upgrade to 1.3.0 or later (affected >= 1.2.0, < 1.3.0)
  • hydra-optuna-sweeper 1.4.0.dev10Fixed version · GitHub Advisories · pip package hydra-optuna-sweeper: upgrade to 1.4.0.dev10 or later (affected >= 1.4.0.dev4, < 1.4.0.dev10)

[ Packages ]Affected open-source packages

  • hydra-optuna-sweeper pipAffected >= 1.2.0, < 1.3.0 · fixed in 1.3.0 · GHSA-5jjj-9xc3-rm56
  • hydra-optuna-sweeper pipAffected >= 1.4.0.dev4, < 1.4.0.dev10 · fixed in 1.4.0.dev10 · GHSA-5jjj-9xc3-rm56

[ References ]References