All vulnerabilities
CVE-2026-104419GHSA-qhr3-cvch-5fh2

Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes

ZcashFoundation zebra
Open in ThreatlineRecord JSON
CVSS
6.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.13%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.3.0Fixed versionCVE List
Published2 Oct 2026Updated 5 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 (zebrad) 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a syncing node so that honest peers get banned, eroding its peer set and raising eclipse risk.

Text from CVE List

Affected versions 2

  • zebraaffected: all versions before 6.3.0CVE List
  • zebraunaffected: 6.3.0CVE List

References 2