CVE-2026-106440 · GHSA-5jjj-9xc3-rm56
Hydra: Optuna custom_search_space can resolve and execute untrusted callables via get_method
- Risk score
- 56/100
- CVSS
- 7.8 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 6 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 Hy…
- Affected
- hydra-optuna-sweeper (pip) >= 1.2.0, < 1.3.0; hydra-optuna-sweeper (pip) >= 1.4.0.dev4, < 1.4.0.dev10
- Fix
- Upgrade hydra-optuna-sweeper to 1.3.0 or 1.4.0.dev10 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.8 high
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| hydra-optuna-sweeper | pip | >= 1.2.0, < 1.3.0 | 1.3.0 |
| hydra-optuna-sweeper | pip | >= 1.4.0.dev4, < 1.4.0.dev10 | 1.4.0.dev10 |
References
- https://github.com/advisories/GHSA-5jjj-9xc3-rm56
- https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-5jjj-9xc3-rm56
- https://nvd.nist.gov/vuln/detail/CVE-2026-106440
- https://github.com/hydra-ecosystem/hydra/commit/0dd18084589a3d3e577d1f1a8a48fb485c94a5e6
- https://github.com/hydra-ecosystem/hydra/commit/4720dfca2bde27fa140ec287a05709668fbdf168
- https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.7
- https://github.com/advisories/GHSA-5jjj-9xc3-rm56
Original 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.
Last activity 6 Oct 2026. Patch Forecast updates every hour.