CVE-2026-104422 (GCVE-0-2026-104422)
Vulnerability from cvelistv5
Published
2026-10-02 11:38
Modified
2026-10-02 17:35
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
Summary
The block sync download path in Zebra (zebrad) before 6.3.0 reads a block's height from its unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation, without penalizing the supplying peer. Because V5 transaction IDs exclude the scriptSig, a malicious peer can repeatedly serve a canonical block whose coinbase claims height 1 while keeping the requested hash, delaying the node's discovery of the newest block.
References
Impacted products
Vendor Product Version
ZcashFoundation zebra Version: 0   ≤
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