{"id":"CVE-2026-106439","revision":"5dfb4c08b84f4bea9345014f41ebe14c","records":[{"revision":"5dfb4c08b84f4bea9345014f41ebe14c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-106439","aliases":[],"title":"Hydra: Mutable instantiate policy sets allow target blocklist bypass","description":"Hydra is a framework for elegantly configuring complex applications. From 1.3.4 until 1.3.7 and 1.4.0.dev10, Hydra stores legacy instantiate target blocklists and related execution-policy collections in mutable module-level state. An attacker who controls multiple sibling target entries can resolve hydra._internal.target_policy.UNCONTROLLED_EXECUTION_TARGETS.discard through instantiate(), remove a denied target, and then invoke that target because sibling nodes are processed in insertion order against the same modified policy. The mutation persists in process-global state and can enable code execution with the application's privileges, while a narrow execution whitelist supplied by trusted Python code is not bypassed by the reported direct mutation path. This issue is fixed in versions 1.3.7 and 1.4.0.dev10.","state":0,"publishedAt":"2026-10-06T18:49:12.11+00:00","modifiedAt":"2026-10-06T19:48:45.736+00:00","affected":[{"ecosystem":"Vendor product","name":"hydra","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"hydra-ecosystem\",\n                    \"product\": \"hydra\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.3.4, < 1.3.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.4.0.dev4, < 1.4.0.dev10\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.5,"severity":"HIGH"}],"references":["https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-mwj6-rfh8-7qf4","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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-106439","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-106439","identifiers":["CVE-2026-106439"]},"retained":false,"historicalAffected":[]}],"coverage":[]}