CVE-2026-104435 Zebra zebrad & zebra-script - Authentication Bypass

Zebra zebrad 4.4.0 and zebra-script 6.0.0 contain a consensus rule enforcement bypass caused by accepting V5 transparent inputs signed with SIGHASH_SINGLE lacking corresponding outputs, letting attackers cause network consensus split, exploit requires crafted V5 transactions.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
2 October 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Update to the latest version that enforces ZIP-244 consensus rules correctly.

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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