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Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106440Hydra: Optuna custom_search_space can resolve and execute untrusted callables via get_method

High 7.8

In plain English

A high-severity security flaw in hydra from hydra-ecosystem. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 80.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIhydra-optuna-sweeper1.3.0GHSA-5jjj-9xc3-rm56
PyPIhydra-optuna-sweeper1.4.0.dev10GHSA-5jjj-9xc3-rm56
PyPIhydra-optuna-sweeper1.3.0, 1.4.0.dev10PYSEC-2026-4224

Affected products (as reported)

VendorProductVersions
hydra-ecosystem hydra >= 1.2.0, < 1.3.0>= 1.4.0.dev4, < 1.4.0.dev10

Weakness: CWE-470 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References