{"items":[{"id":"NVI-00017735","kind":"vulnerability","title":" Lemur: JWT verifier honors attacker-supplied alg, enabling ATO","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-r9gp-7f88-9r54","CVE-2026-55165"],"plain_summary":"GitHub lists this reviewed advisory for lemur. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-531242d6f1604a25c54de8b0ee0f3644"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-25T22:05:18.000Z","value":"4.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-531242d6f1604a25c54de8b0ee0f3644"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-531242d6f1604a25c54de8b0ee0f3644","url":"https://github.com/advisories/GHSA-r9gp-7f88-9r54","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r9gp-7f88-9r54","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T19:05:53.922Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-531242d6f1604a25c54de8b0ee0f3644"],"technology":"lemur","known_exclusions":[],"conditions_summary":"Lemur 1.9.0: JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure\nVulnerability Summary\n\nField | Value\n-- | --\nTitle | Lemur 1.9.0: JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure\nComponent | lemur/lemur/auth/service.py:130-137\nCWE | CWE-347 (Improper Verification of Cryptographic Signature)\nAttack Prerequisite | Defense-in-depth gap on its own — no single-request exploit against PyJWT 2.x. Single-request ATO requires a separate disclosure issue that leaks LEMUR_TOKEN_SECRET, or a future migration to asymmetric signing without fixing this sink.\nAffected Versions | github.com/Netflix/lemur __version__ = \"1.9.0\". Same code present in every prior release that has the auth/service.py:130 block.\n\n\nExecutive Summary\nThe Lemur JWT verifier reads the alg heade","public_affected_ranges":["< 1.9.2"]}],"null_published_at":"2026-11-05T19:10:21.459Z","source_updated_at":"2026-06-25T22:05:18.000Z","source_disclosed_at":"2026-06-25T22:05:17.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-05T19:05:53.922Z"}],"next_cursor":null,"snapshot_revision":"42594"}