Malicious peer can make node stuck in blocksync in github.com/cometbft/cometbft

{
  "id": "f14d0ff7b1d9f7e37ef0da49fe59930a883b1736f4d836fc115d3d80ae9b317b",
  "url": "https://osv.dev/vulnerability/CVE-2025-24371",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious peer can make node stuck in blocksync in github.com/cometbft/cometbft",
    "summary": "CometBFT is a distributed, Byzantine fault-tolerant, deterministic state machine replication engine. In the `blocksync` protocol peers send their `base` and `latest` heights when they connect to a new node (`A`), which is syncing to the tip of a network. `base` acts as a lower ground and informs `A` that the peer only has blocks starting from height `base`. `latest` height informs `A` about the latest block in a network. Normally, nodes would only report increasing heights. If `B` fails to provide the latest block, `B` is removed and the `latest` height (target height) is recalculated based on other nodes `latest` heights. The existing code however doesn't check for the case where `B` first reports `latest` height `X` and immediately after height `Y`, where `X > Y`. `A` will be trying to catch up to 2000 indefinitely. This condition requires the introduction of malicious code in the full node first reporting some non-existing `latest` height, then reporting lower `latest` height and nodes which are syncing using `blocksync` protocol. This issue has been patched in versions 1.0.1 and 0.38.17 and all users are advised to upgrade. Operators may attempt to ban malicious peers from the network as a workaround.",
    "evidence": "osv:CVE-2025-24371",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-24371",
      "aliases": [
        "CVE-2025-24371",
        "GHSA-22qq-3xwm-r5x4",
        "GO-2025-3442"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cometbft/cometbft",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d03254d3599b973f979314e6383b89fa1802e679"
                },
                {
                  "introduced": "ce344cc66cb2a9c5e8bb934cf1fa297a442c8b07"
                },
                {
                  "fixed": "d22299509a50140b74d81b113c4d78e4cf501994"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.38.17"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "= 1.0.0"
                      },
                      {
                        "last_affected": "= 1.0.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d03254d3599b973f979314e6383b89fa1802e679"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.38.17"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d22299509a50140b74d81b113c4d78e4cf501994"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.0.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "= 1.0.0",
            "v0.38.16",
            "v1.0.0",
            "v0.38.15",
            "v0.38.14",
            "v0.38.13",
            "v0.38.12",
            "v0.38.11",
            "v0.38.10",
            "v0.38.9",
            "v0.38.8",
            "v0.38.7",
            "v0.38.6",
            "v0.38.5",
            "v0.38.4",
            "v0.38.3",
            "v0.38.2",
            "v0.38.1",
            "v0.38.0",
            "v0.38.0-rc3",
            "v0.38.0-rc2",
            "v0.38.0-rc1",
            "v0.38.0-alpha.2",
            "v0.38.0-alpha.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-24371.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.499004834Z",
      "provider": "osv",
      "references": [
        "https://github.com/cometbft/cometbft/releases/tag/v0.38.17",
        "https://github.com/cometbft/cometbft/releases/tag/v1.0.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/24xxx/CVE-2025-24371.json",
        "https://github.com/cometbft/cometbft/security/advisories/GHSA-22qq-3xwm-r5x4",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-24371"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-703"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/24xxx/CVE-2025-24371.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-24371",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505655,
  "published_at": "2025-02-03T21:20:56.024+00:00"
}