GHSA-pf4j-pf3w-95f9

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Source
https://github.com/advisories/GHSA-pf4j-pf3w-95f9
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-pf4j-pf3w-95f9/GHSA-pf4j-pf3w-95f9.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-pf4j-pf3w-95f9
Aliases
Published
2026-04-22T19:22:53Z
Modified
2026-05-05T16:09:54Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
Summary
nimiq-transaction: UpdateValidator transactions allows voting key change without proof-of-knowledge
Details

Impact

The staking contract accepts UpdateValidator transactions that set new_voting_key=Some(...) while omitting new_proof_of_knowledge. this skips the proof-of-knowledge requirement that is needed to prevent BLS rogue-key attacks when public keys are aggregated.

Because tendermint macro block justification verification aggregates validator voting keys and verifies a single aggregated BLS signature against that aggregate public key, a rogue-key voting key in the validator set can allow an attacker to forge a quorum-looking justification while only producing a single signature.

While the impact is critical, the exploitability is low: The voting keys are fixed for the epoch, so the attacker would need to know the next epoch validator set (chosen through VRF), which is unlikely.

Patches

The patch for this vulnerability is included as part of v1.3.0.

Workarounds

No known workarounds.

Database specific 
{
    "cwe_ids": [
        "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T19:22:53Z",
    "nvd_published_at": "2026-04-22T21:17:08Z",
    "severity": "MODERATE"
}
References

Affected packages

crates.io / nimiq-transaction

Package

Name
nimiq-transaction
View open source insights on deps.dev
Purl
pkg:cargo/nimiq-transaction

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Last Affected
0.2.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-pf4j-pf3w-95f9/GHSA-pf4j-pf3w-95f9.json"