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Advisories

Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Check

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severity
high
date
Affecting

  • zebra >= 0, < 6.1.0

CWE
  • CWE-407 Inefficient Algorithmic Complexity
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
ValarDragon, oxarbitrage
Description
Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remaining_transaction_value that clones the entire block-level spent-UTXO map per transaction during contextual verification. Attackers can mine or seed the mempool with roughly 26,000 minimal single-input transactions in one block, stalling every validating node for over 52 seconds.

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