CVE-2026-40880

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, 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, nvd
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
17.5%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 27, 2026

Advisory Details (1)

Auto-updated May 5, 2026
Patch available. Sources: github.
github Patch Available

Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks · Advisory · ZcashFoundation/zebra · GitHub

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-xvj8-ph7x-65gf

Affected Packages

(2 across 1 ecosystem)
crates.io(2)
PackageVulnerable rangeFixed inDependents
zebra-consensus—5.0.2—
zebrad—4.3.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:15 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
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  21. 2026-06-23 21:33 UTCEPSS rescore
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  24. 2026-06-21 14:56 UTCEPSS rescore
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  1. 2026-06-21 01:59 UTCEPSS rescore
  2. 2026-06-19 19:25 UTCEPSS rescore
  3. 2026-06-18 17:52 UTCEPSS rescore
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  5. 2026-06-17 17:53 UTCEPSS rescore
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  7. 2026-06-15 17:49 UTCEPSS rescore
  8. 2026-06-15 06:08 UTCEG score recompute
  9. 2026-06-14 17:44 UTCEG score recompute
  10. 2026-06-13 23:00 UTCEPSS rescore
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  13. 2026-06-12 06:04 UTCEG score recompute
  14. 2026-06-11 17:43 UTCEG score recompute
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  18. 2026-06-10 13:22 UTCEPSS rescore
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  20. 2026-06-10 05:05 UTCEG score recompute
  21. 2026-06-09 16:41 UTCEG score recompute
  22. 2026-06-09 04:20 UTCEG score recompute
  23. 2026-06-08 14:56 UTCEG score recompute
  24. 2026-06-08 14:17 UTCEPSS rescore
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  26. 2026-06-08 02:34 UTCEG score recompute
  27. 2026-06-07 15:25 UTCEPSS rescore
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  29. 2026-06-07 14:13 UTCEG score recompute
  30. 2026-06-07 01:32 UTCEG score recompute
  31. 2026-06-06 13:47 UTCEPSS rescore
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  33. 2026-06-06 08:27 UTCEG score recompute
  34. 2026-06-05 22:47 UTCEPSS rescore
  35. 2026-06-05 20:04 UTCEG score recompute
  36. 2026-06-05 06:24 UTCEG score recompute
  37. 2026-06-05 06:10 UTCEPSS rescore
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  39. 2026-06-04 14:53 UTCEG score recompute
  40. 2026-06-04 13:12 UTCEPSS rescore
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  42. 2026-06-04 02:19 UTCEG score recompute
  43. 2026-06-03 13:53 UTCEG score recompute
  44. 2026-06-02 20:13 UTCEPSS rescore
  45. 2026-06-02 17:55 UTCEG score recompute
  46. 2026-06-02 05:32 UTCEG score recompute
  47. 2026-06-01 15:54 UTCEG score recompute
  48. 2026-06-01 13:52 UTCEPSS rescore
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  51. 2026-05-31 22:30 UTCEPSS rescore
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  65. 2026-05-26 07:18 UTCEPSS rescore
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  67. 2026-05-23 00:08 UTCEG score recompute
  68. 2026-05-20 22:38 UTCEPSS rescore
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  71. 2026-05-20 11:22 UTCEPSS rescore
  72. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-40880?
CVE-2026-40880 is a high vulnerability published on April 21, 2026. ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but…
When was CVE-2026-40880 disclosed?
CVE-2026-40880 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40880 actively exploited?
CVE-2026-40880 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40880?
CVE-2026-40880 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-40880?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40880, 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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