CVE-2026-104429

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

State: Published
Severity: 6.9 Medium
Published: Oct 2, 2026
Updated: Oct 2, 2026
Reserved: Oct 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	VulnCheck
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	VulnCheck

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
zebraZcashFoundation	before 6.0.0-rc.0Affected 6.0.0-rc.0Not affected

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 Messagesthird-party-advisory

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