High, CVSS 7.8PyPIPublished
Hydra: Optuna custom_search_space can resolve and execute untrusted callables via get_method
CVE-2026-106440 · GHSA-5jjj-9xc3-rm56
- Affected
- PyPI hydra-optuna-sweeper >= 1.2.0, < 1.3.0; >= 1.4.0.dev4, < 1.4.0.dev10
- Fixed in
- 1.3.01.4.0.dev10· Vendor fix available
- Issue
- hydra-optuna-sweeper accepted a configuration-controlled dotted path in hydra.sweeper.customsearchspace, resolved it with the lower-level hydra.utils.getmethod() 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…
Recommended action: Upgrade to 1.4.0.dev10 (pre-release) or 1.3.0 by release line, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.