CVE-2026-104429

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductZcashfoundation Zebra

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

ZcashFoundation zebra6.0.0-rc.0 or later

Vendor advisories

github.com/ZcashFoundation/zebra/security/advisories/GHSA-m9xx-8rcj-vmgp

Affected products

Product	Affected versions	Fixed in
ZcashFoundation zebra	v < 6.0.0-rc.0	6.0.0-rc.0

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