All vulnerabilities
CVE-2026-104429GHSA-m9xx-8rcj-vmgp

Zebra before 6.0.0-rc.0 Per-Peer Mempool Admission Bypass via P2P tx Messages

ZcashFoundation zebra
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 22% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.0.0-rc.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 (zebrad) 5.0.0 before 6.0.0-rc.0 does not apply its per-peer mempool admission cap to transactions received as direct P2P tx messages, because these are queued without the sending peer recorded as their source. A remote inbound peer can push many unique transactions to occupy a disproportionate share of mempool admission slots, crowding out honest peers' transaction relay.

Text from CVE List

Affected versions 2

  • zebraaffected: all versions before 6.0.0-rc.0CVE List
  • zebraunaffected: 6.0.0-rc.0CVE List

References 2