Vulnerability · Published Oct 2, 2026 · Assigned by VulnCheck

CVE-2026-104429Zebra before 6.0.0-rc.0 Per-Peer Mempool Admission Bypass via P2P tx Messages

Medium 5.3

In plain English

A medium-severity resource allocation without limits in zebra from ZcashFoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 76.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
ZcashFoundation	zebra	0 – before 6.0.0-rc.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-m9xx-8rcj-vmgp) vendor-advisory
VulnCheck Advisory: Zebra before 6.0.0-rc.0 Per-Peer Mempool Admission Bypass via P2P tx Messages third-party-advisory