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CVE-2026-40092 — Vulnerability in nimiq-keys — CVE Details

HIGH

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

Published May 15, 2026Updated June 8, 2026Source: osv

Summary

### Impact A malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record containing a `TaggedSigned<ValidatorRecord, KeyPair>` 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. ### Patches [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). ### Workarounds No known workarounds. ### Resources See [PR](https://github.com/nimiq/core-rs-albatross/pull/3708).

Advisory Timeline

  • First published May 15, 2026 (150 days ago).
  • Last revised June 8, 2026 — 24 days after initial publication.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
nimiq-keys
crates.io
All versionsRange-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Frequently Asked Questions

What is CVE-2026-40092?
nimiq-keys: Unchecked Ed25519 signature length in TaggedPublicKey::verify causes remote node panic via DHT This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-40092?
CVE-2026-40092 affects nimiq-keys. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-40092 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-27w2-87xv-37c6

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