CVE-2026-46540

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.4.0, when LightBlockchain::rebranch() adopts a fork chain whose tip is a macro block (checkpoint or election), it only updates self.head but fails to update self.macro_head, self.election_head, self.current_validators, or store the election header in the chain_store. This is in direct contrast with the full Blockchain::rebranch() at blockchain/src/blockchain/push.rs:504-518, which correctly updates all macro/election state when the new head is a macro block. After a rebranch to a macro block, the stale macro_head causes subsequent macro blocks pushed via push() to be verified against the wrong predecessor via verify_macro_successor(&this.macro_head). If the rebranch target was an election block, the stale current_validators causes every subsequent block to fail verify_validators(), completely stalling the light client's chain progression. This issue has been patched in version 1.4.0.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
17.3%
KEV
Not listed

Published

June 10, 2026

Last Modified

June 10, 2026

Advisory Details (3)

Auto-updated Jun 13, 2026
Patch available. Sources: github_pr, github_release, github.
github Patch Available

Light blockchain rebranch issue · Advisory · nimiq/core-rs-albatross · GitHub

https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-m3pg-qc2q-mg8c
github_release Patch Available

Mainnet 1.4.0

Patch available: nimiq/core-rs-albatross v1.4.0

https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0
github_pr Patch Available

Fixes rebranch logic in light blockchain

Patch available: nimiq/core-rs-albatross v1.4.0 (PR #3706 merged 2026-04-22)

https://github.com/nimiq/core-rs-albatross/pull/3706

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 63× 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.

  1. 2026-07-11 20:41 UTCEG score recompute
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-10 19:22 UTCEG score recompute
  4. 2026-07-09 19:10 UTCEPSS rescore
  5. 2026-07-08 23:44 UTCEG score recompute
  6. 2026-07-08 15:16 UTCEPSS rescore
  7. 2026-07-07 22:24 UTCEG score recompute
  8. 2026-07-07 13:46 UTCEPSS rescore
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 02:23 UTCEPSS rescore
  11. 2026-07-05 14:12 UTCEG score recompute
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 12:47 UTCEG score recompute
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 08:34 UTCEG score recompute
  16. 2026-07-02 06:37 UTCEG score recompute
  17. 2026-07-01 15:07 UTCEPSS rescore
  18. 2026-07-01 05:15 UTCEG score recompute
  19. 2026-06-30 23:22 UTCEPSS rescore
  20. 2026-06-30 03:55 UTCEG score recompute
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-29 02:35 UTCEG score recompute
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 43 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-28 01:15 UTCEG score recompute
  3. 2026-06-27 03:08 UTCEPSS rescore
  4. 2026-06-26 23:54 UTCEG score recompute
  5. 2026-06-25 22:35 UTCEG score recompute
  6. 2026-06-25 13:49 UTCEPSS rescore
  7. 2026-06-24 21:15 UTCEG score recompute
  8. 2026-06-24 14:05 UTCEPSS rescore
  9. 2026-06-23 21:33 UTCEPSS rescore
  10. 2026-06-23 21:33 UTCEPSS rescore
  11. 2026-06-23 19:54 UTCEG score recompute
  12. 2026-06-22 18:35 UTCEG score recompute
  13. 2026-06-22 14:25 UTCEPSS rescore
  14. 2026-06-22 14:25 UTCEPSS rescore
  15. 2026-06-21 16:52 UTCEG score recompute
  16. 2026-06-21 14:56 UTCEPSS rescore
  17. 2026-06-21 14:56 UTCEPSS rescore
  18. 2026-06-21 01:59 UTCEPSS rescore
  19. 2026-06-21 01:59 UTCEPSS rescore
  20. 2026-06-20 14:47 UTCEG score recompute
  21. 2026-06-19 19:26 UTCEPSS rescore
  22. 2026-06-19 19:26 UTCEPSS rescore
  23. 2026-06-19 13:21 UTCEG score recompute
  24. 2026-06-18 17:52 UTCEPSS rescore
  25. 2026-06-18 17:52 UTCEPSS rescore
  26. 2026-06-18 11:59 UTCEG score recompute
  27. 2026-06-17 17:53 UTCEPSS rescore
  28. 2026-06-17 10:37 UTCEG score recompute
  29. 2026-06-16 17:53 UTCEPSS rescore
  30. 2026-06-16 09:16 UTCEG score recompute
  31. 2026-06-15 17:49 UTCEPSS rescore
  32. 2026-06-15 07:55 UTCEG score recompute
  33. 2026-06-14 06:36 UTCEG score recompute
  34. 2026-06-13 23:00 UTCEPSS rescore
  35. 2026-06-13 05:16 UTCEG score recompute
  36. 2026-06-12 23:12 UTCEPSS rescore
  37. 2026-06-12 23:12 UTCEPSS rescore
  38. 2026-06-12 03:57 UTCEG score recompute
  39. 2026-06-11 14:00 UTCEPSS rescore
  40. 2026-06-11 02:37 UTCEG score recompute
  41. 2026-06-10 22:18 UTCEPSS rescore
  42. 2026-06-10 01:18 UTCEG score recompute
  43. 2026-06-10 01:17 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-46540?
CVE-2026-46540 is a medium vulnerability published on June 10, 2026. Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.4.0, when LightBlockchain::rebranch() adopts a fork chain whose tip is a macro block (checkpoint or election), it only updates self.head but fails to update…
When was CVE-2026-46540 disclosed?
CVE-2026-46540 was first published in the National Vulnerability Database on June 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46540 actively exploited?
CVE-2026-46540 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46540?
CVE-2026-46540 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-46540?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46540, 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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