What is CVE-2026-104429?

CVE-2026-104429 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-10-02.

How severe is CVE-2026-104429?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Zcashfoundation Zebra

CVE-2026-104429

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.

Published 2026-10-02 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Zcashfoundation Zebra

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/ZcashFoundation/zebra/security/advisories/GHSA-m9xx-8rcj-vmgp (vendor-advisory)
www.vulncheck.com/advisories/zebra-before-6.0.0-rc.0-per-peer-mempool-admission… (third-party-advisory)

Frequently asked questions

What is CVE-2026-104429?: CVE-2026-104429 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-10-02.
How severe is CVE-2026-104429?: Medium severity. CVSS v3 base score is 5.3 out of 10.