CVE-2026-44497: ZEBRA is a Zcash node written entirely in Rust

Q: How do I fix CVE-2026-44497?

zebra-script: upgrade to 6.0.0; zebrad: upgrade to 4.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-44497 being exploited?

CVE-2026-44497 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-2026-44497 affect?

CVE-2026-44497 affects zebra-script, zebrad. Severity is critical (CVSS 9.1). ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0 and prior to zebra-script version 6.0.0, the fix for CVE-2026-41583 introduced a separate issue due to insufficient error handling of the case where the sighash t

Q: How urgent is CVE-2026-44497?

Priority 39/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADEUPGRADE

CVE-2026-44497 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 4.4.0 and prior to zebra-script version 6.0.0, the fix for CVE-2026-41583 introduced a separate issue due to insufficient error handling of the case where the sighash type is invalid, during sighash computation. Instead of returning an error, the normal flow would resume, and the input sighash buffer would be left untouched. In scenarios where a previous signature validation

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	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-05-08
Last modified	2026-06-17

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

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 15:17 UTCPublished CVE record published
2026-06-17 10:50 UTCUpdated Record last modified

zfnd zebra-script UPGRADE

Affected: < 6.0.0

Fixed in: 6.0.0

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 6.0.0 (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: < 4.4.0

Fixed in: 4.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.4.0 (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-2026-44497?

zebra-script: upgrade to 6.0.0; zebrad: upgrade to 4.4.0. Exact commands for each OS are on this page.

Is CVE-2026-44497 being exploited?

CVE-2026-44497 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-2026-44497 affect?

CVE-2026-44497 affects zebra-script, zebrad. Severity is critical (CVSS 9.1). ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0 and prior to zebra-script version 6.0.0, the fix for CVE-2026-41583 introduced a separate issue due to insufficient error handling of the case where the sighash t

How urgent is CVE-2026-44497?

Priority 39/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-41583 CRITICAL 9.1 UPGRADE UPGRADE ZEBRA is a Zcash node written entirely in Rust

References

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