{"items":[{"id":"NVI-00013151","kind":"vulnerability","title":"mpp vulnerable to Gas Draining with no limit","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-vv77-66rf-pm86"],"plain_summary":"GitHub lists this reviewed advisory for mpp. 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-76eb5831407856ad5fc7d42d54af072e"],"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":[],"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-76eb5831407856ad5fc7d42d54af072e","url":"https://github.com/advisories/GHSA-vv77-66rf-pm86","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-vv77-66rf-pm86","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:25.558Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-76eb5831407856ad5fc7d42d54af072e"],"technology":"mpp","known_exclusions":[],"conditions_summary":"### Details\nWhen the server acts as the fee_payer, the `mpp` Elixir 0.4.0 does not validate `gas_limit`, `max_fee_per_gas` and `max_priority_fee_per_gas` before cosigning the client's fee-payer transaction. A malicious client embeds arbitrarily large `max_fee_per_gas` and `max_priority_fee_per_gas` values in the signed envelope. The server cosigns and broadcasts — paying those inflated gas costs from its own wallet based on the `effective_gas_price` calculated from the high `max_fee_per_gas` and `max_priority_fee_per_gas` set by the client.\n\n**Vulnerable function:** `cosign_fee_payer/3` in `transaction.ex` around lines 229–262.\n\n### PoC\nThe PoC is provided below. It is configured to reproduce the attack on Tempo Moderate testnet within a Docker environment. Download the PoC and run:\n```bash\nunzip mpp_elixir_PoC.zip\ncd mpp_elixir\ndocker build -t mpp-elixir-gasdrain .\ndocker run --rm mpp-elixir-gasdrain\n``` \nThere are more details in `mpp_elixir/README.md`\n\n### Impact\nBy draining the server's wallet, an attacker causes direct financial loss to the organization. Furthermore, if the server's funds are drained completely, legitimate clients will have","public_affected_ranges":[">= 0.2.0, < 0.6.0"]}],"null_published_at":"2026-11-01T07:29:12.926Z","source_updated_at":"2026-09-25T21:44:13.000Z","source_disclosed_at":"2026-09-25T21:44:12.000Z","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":"2026-11-01T07:24:25.558Z"}],"next_cursor":null,"snapshot_revision":"42594"}