All vulnerabilities
CVE-2026-104426GHSA-4g24-549m-hp75

Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Check

ZcashFoundation zebra
Open in ThreatlineRecord JSON
CVSS
8.2High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.31%Chance of exploitation activity in the next 30 days, higher than 22% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.1.0Fixed versionCVE List
Published2 Oct 2026Updated 2 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • zebraaffected: all versions before 6.1.0CVE List
  • zebraunaffected: 6.1.0CVE List

References 2