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CVE-2026-44497

Zfnd Zebrad vulnerability

9.1 CRITICALEPSS 0.30%
  1. Published8 May 2026

Description

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 could leave a valid sighash in the buffer, an invalid hash-type could be incorrectly accepted, which would create a consensus split between Zebra and zcashd nodes. This issue has been patched in zebrad version 4.4.0 and zebra-script version 6.0.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Zfnd Zebrad< 4.4.0
Zfnd Zebra-script< 6.0.0

Remediation

Fixed in
Zfnd Zebrad≥ 4.4.0
Zfnd Zebra-script≥ 6.0.0

References

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Frequently asked

Is CVE-2026-44497 being actively exploited?

CVE-2026-44497 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.30%.

How severe is CVE-2026-44497?

CVE-2026-44497 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2026-44497?

Affected products include Zfnd Zebrad, Zfnd Zebra-script.

How do I fix CVE-2026-44497?

Upgrade affected software to a fixed version, for example Zfnd Zebrad 4.4.0, Zfnd Zebra-script 6.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.