{"items":[{"id":"NVI-00011943","kind":"vulnerability","title":"Socket.IO: Prototype Pollution via Unsafe Client Session Lookup","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-wfpm-5gcm-94cg","CVE-2026-102600"],"plain_summary":"GitHub lists this reviewed advisory for @socket.io/cluster-engine. 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-6812b90b692e353d049b26bbfbe4d302"],"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":"2026-10-05T23:44:22.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6812b90b692e353d049b26bbfbe4d302"}],"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-6812b90b692e353d049b26bbfbe4d302","url":"https://github.com/advisories/GHSA-wfpm-5gcm-94cg","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-wfpm-5gcm-94cg","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T00:59:16.959Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6812b90b692e353d049b26bbfbe4d302"],"technology":"@socket.io/cluster-engine","known_exclusions":[],"conditions_summary":"### Impact\n\nThis is a **prototype pollution / improper client lookup** vulnerability in `@socket.io/cluster-engine`.\n\nServers using `@socket.io/cluster-engine` may be impacted when attacker-controlled session IDs are processed in clustered deployments. A malicious client could use special property names such as `__proto__`, `constructor`, or other inherited object keys as a session identifier, causing the server to read properties from the object prototype chain instead of only real connected clients.\n\nThe impact is **denial of service** through process crash.\n\nApplications not using `@socket.io/cluster-engine` are not affected by this specific issue.\n\nAffected versions:\n\n*  `@socket.io/cluster-engine@0.1.0`\n\n### Patches\n\nThe issue was fixed in:\n\n*  `@socket.io/cluster-engine@0.1.1`\n\n### Workarounds\n\nIf upgrading immediately is not possible, users can reduce exposure by:\n\n- Rejecting or sanitizing suspicious session IDs before they reach the cluster engine.\n- Running the cluster engine behind trusted infrastructure that prevents arbitrary clients from crafting raw Engine.IO session-related requests.\n\nThese workarounds are defense-in-depth only. Upgrading to a patched version is rec","public_affected_ranges":["< 0.1.1"]}],"null_published_at":"2026-11-01T01:03:56.617Z","source_updated_at":"2026-10-05T23:44:22.000Z","source_disclosed_at":"2026-10-05T23:44:21.000Z","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":"2026-11-01T00:59:16.959Z"}],"next_cursor":null,"snapshot_revision":"42594"}