CVE-2026-41583: ZEBRA is a Zcash node written entirely in Rust

Q: How do I fix CVE-2026-41583?

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

Q: Is CVE-2026-41583 being exploited?

CVE-2026-41583 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-2026-41583 affect?

CVE-2026-41583 affects zebra-script, zebrad. Severity is critical (CVSS 9.1). ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types

Q: How urgent is CVE-2026-41583?

Priority 42/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADEUPGRADE

CVE-2026-41583 is a critical-severity flaw (CVSS 9.1) affecting zebra-script, 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 prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade. Zebra nodes could thus accept and eventually mine a block that would be considered invalid by zcashd nodes, creating a consensus split between

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-573
Published	2026-05-08
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

2026-05-08 15:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

zfnd zebra-script 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-script || rpm -q zebra-script || zebra-script --version

2. UPGRADE to 5.0.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zebra-script

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-2026-41583?

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

Is CVE-2026-41583 being exploited?

CVE-2026-41583 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-2026-41583 affect?

CVE-2026-41583 affects zebra-script, zebrad. Severity is critical (CVSS 9.1). ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types

How urgent is CVE-2026-41583?

Priority 42/100. Critical severity; Remotely exploitable, no login, no user action

References

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