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Threatist priority CRITICAL 0 HIGH 0 MEDIUM 1 LOW 1

Signals Exploited in the wild (KEV) 0 Patch available 2 No fix listed 0 Has CVE 2

Fix status Fixed 2 Partial 0 Will not fix 0 Deferred 0 No fix listed 0

Attack vector Network 2 Adjacent network 0 Local 0 Physical 0

Requirements No authentication 2 No user interaction 2

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Weakness (CWE) CWE-405 Asymmetric Resource Consumption (Amplification) 1 CWE-459 Incomplete Cleanup 1

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Release: ZcashFoundation zebra 6.2.1 × Clear all filters

TI-2026-66066 CVE-2026-104423 · GHSA-4x5w-56x5-cmfr

Zebra before 6.2.1 Denial of Service via Uncapped V6 Shielded Proof Verification

Priority MEDIUM 44

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.

CVSS 4.0HIGH 8.7· Network · No auth · No interaction · EPSS 0.00343 · Published 2026-10-02 · Fixed in 6.2.1 CWE-405

TI-2026-66064 CVE-2026-104421 · GHSA-xx63-6p6j-3wv7

Zebra before 6.2.1 Block Download Denial of Service via KnownBlock SentHashes Lockout

Priority LOW 36

Zebra before 6.2.1 contains an incomplete cleanup vulnerability that allows unauthenticated peers to block downloading of valid blocks by leaving rejected hashes in SentHashes.

CVSS 4.0MEDIUM 6.9· Network · No auth · No interaction · EPSS 0.00304 · Published 2026-10-02 · Fixed in 6.2.1 CWE-459

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