{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.50.3"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/cosmos/cosmos-sdk"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.50.0"
            },
            {
              "fixed": "0.50.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.47.8"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/cosmos/cosmos-sdk"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.47.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1285"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-02-21T00:13:46Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## ASA-2024-002: Default `PrepareProposalHandler` may produce invalid proposals when used with default `SenderNonceMempool`\n\n**Component**: Cosmos SDK\n**Criticality**: Medium\n**Affected** Versions: Cosmos SDK versions \u003c= 0.50.3; \u003c= 0.47.8\n**Affected** Users: Chain developers, Validator and Node operators\n**Impact**: Denial of Service\n\n## Summary\n\nWhen using the default `PrepareProposalHandler` and the default `SenderNonceMempool`, an issue was identified which may allow invalid blocks to be proposed when a single sender includes multiple transactions with non-sequential sequence numbers in certain conditions. If this state is reached, it can lead to a reduction in block production for a network.\n\n## Next Steps for Impacted Parties\n\nIf you are a chain developer on an affected version of the Cosmos SDK, it is advised to update to the latest available version of the Cosmos SDK for your project.  Once a patched version is available, it is recommended that network operators upgrade.\n\nA Github Security Advisory for this issue is available in the Cosmos-SDK [repository](https://github.com/cosmos/cosmos-sdk/security/advisories). For more information about Cosmos SDK, see https://docs.cosmos.network/.\n\nThis issue was found by [KonradStaniec](https://github.com/KonradStaniec), [gitferry](https://github.com/gitferry), [SebastianElvis](https://github.com/SebastianElvis), and [vitsalis](https://github.com/vitsalis) who reported it to the Cosmos Bug Bounty Program on HackerOne on January 16, 2024. If you believe you have found a bug in the Interchain Stack or would like to contribute to the program by reporting a bug, please see https://hackerone.com/cosmos.\n",
  "id": "GHSA-2557-x9mg-76w8",
  "modified": "2024-05-23T18:32:11Z",
  "published": "2024-02-21T00:13:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cosmos/cosmos-sdk/security/advisories/GHSA-2557-x9mg-76w8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cosmos/cosmos-sdk/commit/c05850241e2d615721e3492d15fee4e1deec082b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cosmos/cosmos-sdk/commit/fe32bcc1d65412c9b5737672956f0638c729ab7d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cosmos/cosmos-sdk"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cosmos/cosmos-sdk/releases/tag/v0.47.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cosmos/cosmos-sdk/releases/tag/v0.50.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ASA-2024-002: Default `PrepareProposalHandler` may produce invalid proposals when used with default `SenderNonceMempool`"
}