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CVE-2026-46542 nimiq CVE debrief

CVE-2026-46542 is a MEDIUM severity vulnerability in the Nimiq Proof-of-Stake protocol implementation. The issue exists in the Ed25519 multisig delinearization code path, specifically in the `Ed25519PublicKey::delinearize()` function. This function calls `.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. The vulnerability allows for denial-of-service attacks, as invalid keys can reach the delinearization path and crash the hosting process. The issue has been patched in version 1.4.0.

Vendor
nimiq
Product
core-rs-albatross
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-10
Advisory published
2026-06-10
Advisory updated
2026-06-10

Who should care

Users of Nimiq's Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm, particularly those using versions prior to 1.4.0.

Technical summary

The vulnerability is caused by the `Ed25519PublicKey::delinearize()` function calling `.unwrap()` on curve point decompression without validating if the provided bytes represent a valid point on the Ed25519 curve. This can lead to a panic and crash the hosting process when an invalid key is provided.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to version 1.4.0 or later to apply the patch.
  • Validate the curve membership of public keys before passing them to the delinearization function.

Evidence notes

The vulnerability was patched in version 1.4.0. References to the patch and advisory can be found at [ref-5](https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0), [ref-6](https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-h9cc-w26m-j342), and [ref-4](https://github.com/nimiq/core-rs-albatross/pull/3713).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46542 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46542

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46542 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46542

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.