CVE-2026-40880: ZEBRA is a Zcash node written entirely in Rust

Q: How do I fix CVE-2026-40880?

zebra-consensus: upgrade to 5.0.2; zebrad: upgrade to 4.3.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-40880 being exploited?

CVE-2026-40880 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40880 affect?

CVE-2026-40880 affects zebra-consensus, zebrad. Severity is high (CVSS 8.1). 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

Routine

HIGH 8.1UPGRADEUPGRADE

CVE-2026-40880 is a high-severity flaw (CVSS 8.1) affecting zebra-consensus, zebrad. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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, leadi

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-1025
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: zfnd

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 20:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

zfnd zebra-consensus UPGRADE

Affected: < 5.0.2

Fixed in: 5.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zebra-consensus || rpm -q zebra-consensus || zebra-consensus --version

2. UPGRADE to 5.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zebra-consensus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zebra-consensus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

zfnd zebrad UPGRADE

Affected: < 4.3.1

Fixed in: 4.3.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zebrad || rpm -q zebrad || zebrad --version

2. UPGRADE to 4.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zebrad

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zebrad

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40880?

zebra-consensus: upgrade to 5.0.2; zebrad: upgrade to 4.3.1. Exact commands for each OS are on this page.

Is CVE-2026-40880 being exploited?

CVE-2026-40880 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40880 affect?

CVE-2026-40880 affects zebra-consensus, zebrad. Severity is high (CVSS 8.1). 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

How urgent is CVE-2026-40880?

Priority 33/100. High severity

References

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