HIGH 8.7 NVD
CVE-2026-104422
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
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
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-g95h-hw6g-pvgv
- https://www.vulncheck.com/advisories/zebra-before-6.3.0-block-sync-denial-of-service-via-c
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-02 via NVD.
vulnfeed aggregates 10476 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.