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CVE-2026-44497

ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer

Published: May 8, 2026Updated: May 8, 2026 Sources: CVE List NVDCWE-347
9.1CRITICAL
NVD MITRE
EPSS Score
0.2%
Top 91.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-347

Affected Products

zfnd
aka zebra-chain, zebrad, zebra
zebra-scriptMixed
OSS Libraries / generic-library
zebradMixed
OSS Libraries / generic-library
ZcashFoundation
oss-project
zebraOn-prem
OSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-gq4h-3grw-2rhv
github.com

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