Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain

{
  "id": "09d8ec3e22d742e56aa97f0360c71563bd7d6e970260ae60e5fd01d7273dfea7",
  "url": "https://osv.dev/vulnerability/CVE-2026-52878",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain",
    "summary": "Klever-Go is the Go implementation of the Klever blockchain protocol. Versions 1.7.14 through 1.7.17 are vulnerable to a nil-pointer panic triggered by a protobuf Transaction whose embedded RawData sub-message is omitted. This omission causes RawData to decode to nil. Every transaction gossiped on the Klever-Go P2P network is decoded and validated synchronously inside the libp2p pubsub topic-validator callback, where txVersionChecker.CheckTxVersion dereferences tx.RawData.Version with no nil check. Because the libp2p pubsub callback, the underlying go-libp2p-pubsub validation worker, and Klever's own network/p2p layer install no recover(), the panic propagates and crashes the entire node process. The attacker payload is a 3-byte protobuf message; no validator key, stake, funds, or on-chain account is required, and delivery aimed at enough of the BLS validator set can halt block production, resulting in a chain halt. This issue has been fixed in version 1.7.18.",
    "evidence": "osv:CVE-2026-52878",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-52878",
      "aliases": [
        "CVE-2026-52878",
        "GHSA-rm5c-5x2p-48wr",
        "GO-2026-5628"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/klever-io/klever-go",
              "type": "GIT",
              "events": [
                {
                  "introduced": "22769b30dd782ca7925b356c18471b7bd70ed437"
                },
                {
                  "fixed": "785b77ccb27162506c888cb62657cd7117d23126"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.7.14"
                      },
                      {
                        "fixed": "1.7.18"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "785b77ccb27162506c888cb62657cd7117d23126"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.7.18"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.7.17",
            "v1.7.16",
            "v1.7.15",
            "v1.7.14"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52878.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.109791692Z",
      "provider": "osv",
      "references": [
        "https://github.com/klever-io/klever-go/releases/tag/v1.7.18",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52878.json",
        "https://github.com/klever-io/klever-go/security/advisories/GHSA-rm5c-5x2p-48wr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-52878"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-476"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52878.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52878",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491701,
  "published_at": "2026-08-07T22:32:27.34+00:00"
}