HIGH 8.7 NVD
CVE-2026-104423
Zebra (zebrad) before 6.2.1 contains an asymmetric resource consumption vulnerability that allows unauthenticated peers to stall block verification by pushing V
Zebra (zebrad) before 6.2.1 contains an asymmetric resource consumption vulnerability that allows unauthenticated peers to stall block verification by pushing V6 mempool transactions with invalid Halo2 proofs. Attackers can flood the shared unprioritized Halo2 verification queue with zero-fee transactions carrying zero-filled Orchard and Ironwood proofs, causing nodes to fall behind the chain tip.
References
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-2p4c-3q4q-p463
- https://www.vulncheck.com/advisories/zebra-before-6.2.1-denial-of-service-via-uncapped-v6-
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-02 via NVD.
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