CVE-2026-106440: Hydra-Ecosystem Hydra

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Hydra-Ecosystem Hydra: from 1.2.0, before 1.3.0 (fixed in 1.3.0); from 1.4.0.dev4, before 1.4.0.dev10 (fixed in 1.4.0.dev10)

Published 2026-10-06. Last modified 2026-10-09.