{"id":"GHSA-27w2-87xv-37c6","summary":"nimiq-keys: Unchecked Ed25519 signature length in TaggedPublicKey::verify causes remote node panic via DHT","details":"### Impact\nA malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record containing a `TaggedSigned\u003cValidatorRecord, KeyPair\u003e` with a signature field whose byte length is not exactly 64. 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.\n\n### Patches\n[The patch for this vulnerability](https://github.com/nimiq/core-rs-albatross/pull/3708) is formally released as part of [v1.4.0](https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0).\n\n### Workarounds\nNo known workarounds.\n\n### Resources\nSee [PR](https://github.com/nimiq/core-rs-albatross/pull/3708).","aliases":["CVE-2026-40092"],"modified":"2026-06-08T20:30:59.509672444Z","published":"2026-05-15T16:31:22Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-05-15T16:31:22Z","nvd_published_at":"2026-05-20T22:16:36Z","cwe_ids":["CWE-252"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-27w2-87xv-37c6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40092"},{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/pull/3708"},{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/commit/807ee8e99a7ccdc604d49971f292854bfa36754d"},{"type":"PACKAGE","url":"https://github.com/nimiq/core-rs-albatross"},{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0"}],"affected":[{"package":{"name":"nimiq-keys","ecosystem":"crates.io","purl":"pkg:cargo/nimiq-keys"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.2.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-27w2-87xv-37c6/GHSA-27w2-87xv-37c6.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}