{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/babylonlabs-io/babylon/v4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/babylonlabs-io/babylon/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.0.0-snapshot.250805a"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/babylonlabs-io/babylon/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/babylonlabs-io/babylon"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-08T22:20:24Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nA vulnerability exists in Babylon\u2019s BLS vote extension processing where a malicious active validator can submit a VoteExtension with the `block_hash` field omitted from the protobuf serialization. Because protobuf fields are optional, unmarshalling succeeds but leaves `BlockHash` as nil. Babylon then dereferences this nil pointer in consensus-critical code paths (notably `VerifyVoteExtension`, and also proposal-time vote verification), causing a runtime panic.\n\n### Impact\n\nIntermittent validator crashes at epoch boundaries, which would slow down the creation of the epoch boundary block.\n\n### Finder \n\nVulnerability discovered by:\n\n- @GrumpyLaurie55348",
  "id": "GHSA-m6wq-66p2-c8pc",
  "modified": "2025-12-17T01:09:11Z",
  "published": "2025-12-08T22:20:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/babylonlabs-io/babylon/security/advisories/GHSA-m6wq-66p2-c8pc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/babylonlabs-io/babylon/commit/f79ad58c1d5bcab3451cb7a47c91e713935917d7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/babylonlabs-io/babylon"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Babylon Nil BlockHash in BLS vote extensions triggers panics in consensus handlers"
}