CVE-2026-34068

MEDIUMNVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory published 2026-04-22. NVD baseline CVSS 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation. Prior to version 1.3.0, 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. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
10.2%
KEV
Not listed

Published

April 22, 2026

Last Modified

April 24, 2026

Advisory Details (4)

Auto-updated Jun 14, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
github Patch Available🟡 PoC Available

`UpdateValidator` transactions allows voting key change without proof-of-knowledge · Advisory · nimiq/core-rs-albatross · GitHub

https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-pf4j-pf3w-95f9
github_release Patch Available

Mainnet 1.3.0

Patch available: nimiq/core-rs-albatross v1.3.0

https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0
github_pr Patch Available

Fix missing proof-of-knowledge validation on voting key update

Patch available: nimiq/core-rs-albatross v1.3.0 (PR #3654 merged 2026-03-27)

https://github.com/nimiq/core-rs-albatross/pull/3654
github_commit Patch Available

commit e7f0ab7d2115 (nimiq/core-rs-albatross)

Patch available: nimiq/core-rs-albatross v1.3.0 (contains commit e7f0ab7d2115)

https://github.com/nimiq/core-rs-albatross/commit/e7f0ab7d2115e17d6e5548ddc60f10df1a5d645f

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
rustnimiq-transaction—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
nimiq-transaction———

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-23 03:09 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-19 23:48 UTCOSV refresh
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  27. 2026-06-14 23:18 UTCEPSS rescore
  28. 2026-06-14 12:27 UTCGHSA enrichment
  29. 2026-06-13 23:00 UTCEPSS rescore
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  32. 2026-06-11 14:32 UTCGHSA enrichment
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  36. 2026-06-10 08:16 UTCGHSA enrichment
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  40. 2026-06-08 07:44 UTCGHSA enrichment
  41. 2026-06-07 15:25 UTCEPSS rescore
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  44. 2026-06-07 09:15 UTCGHSA enrichment
  45. 2026-06-06 10:47 UTCGHSA enrichment
  46. 2026-06-05 22:47 UTCEPSS rescore
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  48. 2026-06-05 11:22 UTCGHSA enrichment
  49. 2026-06-05 06:10 UTCEPSS rescore
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  53. 2026-06-04 12:53 UTCGHSA enrichment
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  55. 2026-06-02 20:13 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-34068?
CVE-2026-34068 is a medium vulnerability published on April 22, 2026. nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation. Prior to version 1.3.0, the staking contract accepts UpdateValidator transactions that set newvotingkey=Some(...) while omitting newproofof_knowledge. this skips the proof-of-knowledge requirement that…
When was CVE-2026-34068 disclosed?
CVE-2026-34068 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34068 actively exploited?
CVE-2026-34068 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34068?
CVE-2026-34068 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-34068?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34068, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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