What is CVE-2026-104424?

CVE-2026-104424 is a low-severity vulnerability in Zcashfoundation Zebra, classified under Incorrect Calculation of Buffer Size. CVSS score: 3.7/10. Published 2026-10-02.

How severe is CVE-2026-104424?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Zcashfoundation Zebra

CVE-2026-104424

Zebra before 6.1.0 contains an incorrect calculation vulnerability in its ZIP-317 block template selector that omits header and transaction-count size from the block budget. Attackers can place valid selectable transactions in a victim miner's mempool to shape templates into oversized blocks, causing rejection and wasted proof-of-work.

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

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/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-131 — Incorrect Calculation of Buffer Size

References

github.com/ZcashFoundation/zebra/security/advisories/GHSA-95m2-vx53-v2jw (vendor-advisory)
www.vulncheck.com/advisories/zebra-before-6.1.0-incorrect-block-size-calculatio… (third-party-advisory)

Frequently asked questions

What is CVE-2026-104424?: CVE-2026-104424 is a low-severity vulnerability in Zcashfoundation Zebra, classified under Incorrect Calculation of Buffer Size. CVSS score: 3.7/10. Published 2026-10-02.
How severe is CVE-2026-104424?: Low severity. CVSS v3 base score is 3.7 out of 10.