CVE-2026-104430 Zebra zebrad & zebra-script - Denial of Service

Zebra zebrad 4.5.0 and zebra-script 7.0.0 contain a consensus divergence caused by incorrect counting of P2SH redeem script signature operations in legacy mode, letting remote attackers cause Zebra nodes to reject valid blocks, exploit requires broadcasting crafted P2SH spends.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.41% 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
2 October 2026
Updated
15 October 2026
Weakness
CWE-628

Vendor fix

Update to the latest version with accurate P2SH signature operation counting.

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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