Hydra is a framework for elegantly configuring complex applications. From 1.3.4 until 1.3.6 and 1.4.0.dev9, the instantiate() target blacklist introduced for CVE-2026-68508 incompletely checks the effective callable selected by the target field. Execution wrappers such as timeit.timeit, executable deserialization through pickle.loads, aliases, callable-returning helpers, generic dispatch, and deferred calls can obscure or defer the effective target and bypass name-based authorization.
An attacker who causes an application to instantiate untrusted Hydra configuration can use these gaps to execute code with the application's privileges. This issue is fixed in versions 1.3.6 and 1.4.0.dev9.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://github.com/hydra-ecosystem/hydra/commit/2c82bbb3f39603b336cb852461739fd…
security-advisories@github.com
https://github.com/hydra-ecosystem/hydra/commit/f462811117b5ecfd2ed652ed52d6b4e…
security-advisories@github.com
https://github.com/hydra-ecosystem/hydra/pull/3412
security-advisories@github.com
https://github.com/hydra-ecosystem/hydra/pull/3413
security-advisories@github.com
https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.6
security-advisories@github.com
https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-rqx7-p7vv-w7hr
security-advisories@github.com