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OFFICIAL CVE RECORD6.3 Medium

CVE-2026-104436

Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length

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Status
Published
Published
Updated
Assigning organization
VulnCheck

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

ZcashFoundation zebra

Default version status: unaffected

  • 0 to < 4.5.0affected
  • 4.5.0unaffected
pkg:cargo/zebrad

ZcashFoundation zebra-chain

Default version status: unaffected

  • 0 to < 8.0.0affected
  • 8.0.0unaffected
pkg:cargo/zebra-chain

References