Bug 2547635 (CVE-2026-106441)

Summary: CVE-2026-106441 hydra-core: hydra-core: Arbitrary code execution via unsafe logging configuration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: alinfoot, bbrownin, dtrifiro, weaton
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in hydra-core. An attacker who supplies or controls a malicious logging configuration can trigger arbitrary code execution by specifying unauthorized Python classes or factory functions. Because Hydra passes logging configuration directly to Python's logging system without enforcing target execution policies, the specified components are invoked with the privileges of the running application.
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Description OSIDB Bzimport 2026-10-07 19:01:35 UTC 
Hydra is a framework for elegantly configuring complex applications. Prior to 1.3.6 and 1.4.0.dev9, Hydra passes Python logging configuration to logging.config.dictConfig() without applying Hydra's target policy to handler class values or formatter, filter, handler, queue, and listener factories. An attacker who controls Hydra logging configuration can therefore select an importable class or factory and cause it to be invoked with the application's privileges, even in versions where instantiate() is protected because the logging path does not use instantiate(). This issue is fixed in versions 1.3.6 and 1.4.0.dev9.