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nimiq-keys: Unchecked Ed25519 signature length in TaggedPublicKey::verify causes remote node panic via DHT

Type: advisorySources: OSV

nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In versions 1.3.0 and below, a malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record. The maliciously crafted record would contain a TaggedSigned with a signature field whose byte length is not exactly 64 in order to cause a crash. When the victim node's DHT verifier calls TaggedSigned::verify, execution reaches Ed25519Signature::from_bytes(sig).unwrap() in the TaggedPublicKey implementation for Ed25519PublicKey. The from_bytes call fails because ed25519_zebra::Signature::try_from rejects slices not 64 bytes, and the unwrap() panics. The BLS TaggedPublicKey implementation correctly returns false on error; only the Ed25519 implementation panics. This issue has been fixed in version 1.4.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-40092
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 11:05 UTC · Revision 1

Source evidence

nimiq-keys: Unchecked Ed25519 signature length in TaggedPublicKey::verify causes remote node panic via DHT

core-osv · Original source

Published 20 May 2026, 21:16 UTC

nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In versions 1.3.0 and below, a malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record. The maliciously crafted record would contain a TaggedSigned with a signature field whose byte length is not exactly 64 in order to cause a crash. When the victim node's DHT verifier calls TaggedSigned::verify, execution reaches Ed25519Signature::from_bytes(sig).unwrap() in the TaggedPublicKey implementation for Ed25519PublicKey. The from_bytes call fails because ed25519_zebra::Signature::try_from rejects slices not 64 bytes, and the unwrap() panics. The BLS TaggedPublicKey implementation correctly returns false on error; only the Ed25519 implementation panics. This issue has been fixed in version 1.4.0.

osv:CVE-2026-40092
Complete source record
{
  "id": "8dd4c2d1a6d6460f17c32f82c2ef5493ad01a050ae20f55338c94d0c68863fb0",
  "url": "https://osv.dev/vulnerability/CVE-2026-40092",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nimiq-keys: Unchecked Ed25519 signature length in TaggedPublicKey::verify causes remote node panic via DHT",
    "summary": "nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In versions 1.3.0 and below, a malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record. The maliciously crafted record would contain a TaggedSigned with a signature field whose byte length is not exactly 64 in order to cause a crash. When the victim node's DHT verifier calls TaggedSigned::verify, execution reaches Ed25519Signature::from_bytes(sig).unwrap() in the TaggedPublicKey implementation for Ed25519PublicKey. The from_bytes call fails because ed25519_zebra::Signature::try_from rejects slices not 64 bytes, and the unwrap() panics. The BLS TaggedPublicKey implementation correctly returns false on error; only the Ed25519 implementation panics. This issue has been fixed in version 1.4.0.",
    "evidence": "osv:CVE-2026-40092",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-40092",
      "aliases": [
        "CVE-2026-40092",
        "GHSA-27w2-87xv-37c6"
      ],
      "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/nimiq/core-rs-albatross",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e156ecc4a14377eb3e4b71f340a8ae905b9864b2"
                },
                {
                  "fixed": "807ee8e99a7ccdc604d49971f292854bfa36754d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "807ee8e99a7ccdc604d49971f292854bfa36754d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e156ecc4a14377eb3e4b71f340a8ae905b9864b2"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.4.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.3.0",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.1",
            "v1.1.0",
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            "v1.0.8",
            "v1.0.7",
            "v1.0.6",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v1.0.0-rc.5",
            "v1.0.0-rc.4",
            "v1.0.0-rc.3",
            "v1.0.0-rc.2",
            "v1.0.0-rc.1",
            "v1.0.0-rc.0",
            "v0.24.4",
            "v0.24.3",
            "v0.24.2",
            "v0.24.1",
            "v0.24.0",
            "v0.23.0",
            "v0.22.3",
            "v0.22.2",
            "v0.22.1",
            "v0.22.0",
            "v0.21.1",
            "v0.21.0",
            "v0.20.5",
            "v0.20.4",
            "v0.20.3",
            "v0.20.2",
            "v0.20.1",
            "v0.20.0",
            "v0.19.0",
            "v0.18.0",
            "v0.17.0",
            "v0.16.1",
            "v0.16.0",
            "v0.15.0",
            "v0.14.0",
            "v0.13.1",
            "v0.13.0",
            "v0.12.1",
            "v0.12.0",
            "v0.11.5",
            "v0.11.4",
            "v0.11.3",
            "v0.11.2",
            "v0.11.1",
            "v0.11.0",
            "v0.10.0",
            "v0.9.0",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.0",
            "v0.6.0",
            "v0.5.4",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.1",
            "v0.4.0",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "v0.1.0",
            "v0.1.0-rc.3",
            "v0.1.0-rc.2",
            "v0.1.0-rc.1",
            "v0.1.0-rc.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40092.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.452442296Z",
      "provider": "osv",
      "references": [
        "https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40092.json",
        "https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-27w2-87xv-37c6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40092",
        "https://github.com/nimiq/core-rs-albatross/commit/807ee8e99a7ccdc604d49971f292854bfa36754d",
        "https://github.com/nimiq/core-rs-albatross/pull/3708"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-252"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40092.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40092",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501846,
  "published_at": "2026-05-20T21:16:40.805+00:00"
}