Vulnerability in Zcashfoundation Zebra
CVE-2026-104427
Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causing the next canonical block to be rejected and stalling the node for roughly 2,000 blocks.
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
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
Weakness classification (CWE)
References
- github.com/ZcashFoundation/zebra/security/advisories/GHSA-8gxx-hc65-vv82 (vendor-advisory)
- www.vulncheck.com/advisories/zebra-before-6.1.0-chain-stall-via-stale-parent-er… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104427?
- CVE-2026-104427 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Incomplete Cleanup. CVSS score: 5.9/10. Published 2026-10-02.
- How severe is CVE-2026-104427?
- Medium severity. CVSS v3 base score is 5.9 out of 10.