Medium severity · published Oct 2, 2026
CVE-2026-104428
Zebra before 11.0.0 Denial of Service via getblock Verbosity 2
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZE
zebra · ZcashFoundation
before 11.0.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104428
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104428
vendor-advisory
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-x6v8-c2xp-928m
third-party-advisory
https://www.vulncheck.com/advisories/zebra-before-11.0.0-denial-of-service-via-getblock-verbosity-2
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