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    CVE-2026-104420

    Zebra before 6.3.0 contains a protection mechanism failure that allows unauthenticated peers to evade misbehavior scoring by supplying invalid gossiped blocks. The inbound cleanup step wrongly downcasts RouterError to VerifyBlockError and discards the score, so attackers can repeatedly force block download and Equihash verification without being banned.

    Published:Oct 2, 2026
    Last Modified:Oct 6, 2026
    EPS:Oct 2, 2026
    EPSS Score:0.00304
    CVSS Score:5.3

    Affected Products

    Vendor
    Zcashfoundation
    Product
    Zebra
    Vendor
    Zfnd
    Product
    Zebra

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-109365 (CVSS 6.3) — Zebra before 6.4.0 contains an uncontrolled resource consumption vulnerability that allows unauthenticated pee…
    CVE-2026-109364 (CVSS 6.9) — Zebra 2.3.0 before 6.4.0 contains a protection mechanism failure that allows unauthenticated peers to evade ba…
    CVE-2026-109363 (CVSS 8.7) — ZcashFoundation Zebra 6.4.0 before 6.4.2 parses version 6 transactions carrying a pre-NU6.3 consensus branch I…
    CVE-2026-104437 (CVSS 8.3) — Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, com…
    CVE-2026-104436 (CVSS 6.3) — Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to…
    CVE-2026-104435 (CVSS 8.3) — Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent i…
    CVE-2026-104434 (CVSS 7.1) — ZcashFoundation Zebra zebra-rpc before 8.0.0 and zebrad before 4.5.0 contain a reachable assertion in the z_li…
    CVE-2026-104432 (CVSS 6.9) — Zebra before 6.3.0 contains an improper exceptional condition check in ChainSync::obtain_tips that discards va…
    CVE-2026-104431 (CVSS 8.7) — Zebra before 6.0.0 contains a denial of service vulnerability that allows unauthenticated peers to stall Tokio…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High