CVE-2026-109363 ZcashFoundation Zebra - Denial of Service

ZcashFoundation Zebra < 6.4.2 contains a denial of service caused by improper error handling during UnminedTx construction with pre-NU6.3 consensus branch ID transactions, letting unauthenticated peers crash the node remotely, exploit requires sending a crafted pre-handshake tx message.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.43% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-617

Vendor fix

Upgrade to version 6.4.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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