{"cve":"CVE-2026-106439","nvd":{"published":"2026-10-06T19:18:12.720","modified":"2026-10-06T20:17:25.917","status":"Awaiting Analysis","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.","cvss_v4":{"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},"cvss_v3":null,"cwes":["CWE-470","CWE-693"],"references":["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/hydra-ecosystem/hydra/security/advisories/GHSA-mwj6-rfh8-7qf4","https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-mwj6-rfh8-7qf4"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:01.639778232+00:00"},"epss":{"cve":"CVE-2026-106439","score":0.00457,"percentile":0.39377,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-mwj6-rfh8-7qf4","url":"https://osv.dev/vulnerability/GHSA-mwj6-rfh8-7qf4","summary":"Hydra: Mutable instantiate policy sets allow target blocklist bypass","modified":"2026-10-15T14:55:36.550457151Z","packages":[{"ecosystem":"PyPI","name":"hydra-core","purl":"pkg:pypi/hydra-core","ranges":[">=1.3.4 <1.3.7"],"fixed":["1.3.7"]},{"ecosystem":"PyPI","name":"hydra-core","purl":"pkg:pypi/hydra-core","ranges":[">=1.4.0.dev4 <1.4.0.dev10"],"fixed":["1.4.0.dev10"]}]},{"id":"PYSEC-2026-4222","url":"https://osv.dev/vulnerability/PYSEC-2026-4222","summary":"Hydra: Mutable instantiate policy sets allow target blocklist bypass","modified":"2026-10-15T14:45:07.445702695Z","packages":[{"ecosystem":"PyPI","name":"hydra-core","purl":"pkg:pypi/hydra-core","ranges":[">=1.3.4 <1.3.7",">=1.4.0.dev4 <1.4.0.dev10"],"fixed":["1.3.7","1.4.0.dev10"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}