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    CVE-2026-104436

    Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.

    Published:Oct 2, 2026
    Last Modified:Oct 29, 2026
    EPS:Oct 2, 2026
    EPSS Score:0.00273
    CVSS Score:3.7

    Affected Products

    Vendor
    Zcashfoundation
    Product
    Zebra
    Vendor
    Zfnd
    Product
    Zebra
    Vendor
    Zfnd
    Product
    Zebra-chain

    Exploits

    No exploit reference

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    CVE-2026-104437 (CVSS 8.3) — Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, com…
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    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