CVE-2026-104437 Zebra - Consensus Divergence

Zebra < 4.4.0 contains a consensus divergence vulnerability caused by incorrect ZIP-244 digest computation for SIGHASH_SINGLE inputs lacking outputs in V5 transparent signature verification, letting attackers craft invalid blocks, exploit requires crafting specific 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
Consensus Divergence
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 version 4.4.0 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

← All CVEs