Is CVE-2026-40880 in the CISA KEV catalog?

No. CVE-2026-40880 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40880?

CVE-2026-40880 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2026-40880?

CVE-2026-40880 has an EPSS score of 0.26% (18th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40880?

Upgrade zebra-consensus to 5.0.2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-40880

HIGH

8.1

CVSS v3

NVD

Description

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.

CWE-1025

How to fix

Remediation Available

zebra-consensusNVD

Affected:< 5.0.2Fixed in:5.0.2CVE-2026-40880derived from NVD

zebradNVD

Affected:< 4.3.1Fixed in:4.3.1CVE-2026-40880derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Exploit Intelligence

0.26%probability of exploitation in 30 days

18thpercentile

Low risk: more likely to be exploited than 18% of all known CVEs.

References

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-1025 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-32464	Medium	6.8	0.7%	-	Fix
CVE-2024-20342	Medium	5.8	0.5%	-	Fix
CVE-2025-71377	High	8.7	0.4%	-	-
CVE-2025-27839	Low	3.2	0.3%	-	-
CVE-2025-2888	Medium	4.5	0.3%	-	Fix
CVE-2025-2887	Medium	4.5	0.3%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-27.