Vulnerability in Zcashfoundation Zebra
CVE-2026-104428
The getblock RPC method in zebra-rpc before 11.0.0, used by the Zcash Foundation's Zebra node, panics on verbosity 2 for a side-chain block because the block's -1 confirmations sentinel is converted to u32 with .expect(), aborting the process. Remote unauthenticated attackers, directly or through lightwalletd, can repeat this call to keep the node in a crash loop.
Published .
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
Weakness classification (CWE)
References
- github.com/ZcashFoundation/zebra/security/advisories/GHSA-x6v8-c2xp-928m (vendor-advisory)
- www.vulncheck.com/advisories/zebra-before-11.0.0-denial-of-service-via-getblock… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104428?
- CVE-2026-104428 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-10-02.
- How severe is CVE-2026-104428?
- Medium severity. CVSS v3 base score is 5.3 out of 10.