{"items":[{"id":"NVI-00017567","kind":"vulnerability","title":"zebrad has mempool transaction admission denial via single-peer inbound queue saturation","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-4fc2-h7jh-287c","CVE-2026-52732"],"plain_summary":"GitHub lists this reviewed advisory for zebrad. 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-21bf6a62b6e22ffe62adb8e6028c8f8d"],"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":"2026-07-02T19:39:02.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-21bf6a62b6e22ffe62adb8e6028c8f8d"}],"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-21bf6a62b6e22ffe62adb8e6028c8f8d","url":"https://github.com/advisories/GHSA-4fc2-h7jh-287c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-4fc2-h7jh-287c","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T03:47:11.081Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-21bf6a62b6e22ffe62adb8e6028c8f8d"],"technology":"zebrad","known_exclusions":[],"conditions_summary":"### Am I affected\n\nYou are affected if:\n\n1. You run `zebrad` up to and including `v4.4.1`.\n2. Your node accepts inbound P2P connections (`network.listen_addr` is set, which is the default).\n3. Your node's mempool is active (node is synced near the chain tip).\n\nAll default configurations are affected.\n\n### Summary\n\nA single unauthenticated P2P peer can monopolize all 25 inbound mempool download/verification slots (`MAX_INBOUND_CONCURRENCY`) by advertising fake transaction IDs. While the slots are occupied, all other inbound transactions from honest peers and local RPC `sendrawtransaction` calls are rejected with `MempoolError::FullQueue`. The attacker peer is never scored for misbehavior and is not disconnected, allowing sustained denial of mempool admission.\n\n### Details\n\nThe mempool download/verification pipeline at `zebrad/src/components/mempool/downloads.rs` uses a single bounded pool of 25 concurrent tasks. Three architectural gaps combine to produce the vulnerability:\n\n1. No per-peer accounting: the 25 slots are shared across all peers with no cap on how many a single peer can hold.\n2. No overload signaling: when `FullQueue` is returned, the inbound service at `zebrad/src/comp","public_affected_ranges":["<= 4.4.1"]}],"null_published_at":"2026-11-05T19:10:21.417Z","source_updated_at":"2026-07-02T19:39:02.000Z","source_disclosed_at":"2026-07-02T19:39:02.000Z","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":"2026-11-05T03:47:11.081Z"}],"next_cursor":null,"snapshot_revision":"42594"}