Vulnerability · Published Oct 2, 2026 · Assigned by VulnCheck

CVE-2026-104428Zebra before 11.0.0 Denial of Service via getblock Verbosity 2

Medium 5.3

In plain English

A medium-severity security flaw in zebra from ZcashFoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 67.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
ZcashFoundation	zebra	0 – before 11.0.0

Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-x6v8-c2xp-928m) vendor-advisory
VulnCheck Advisory: Zebra before 11.0.0 Denial of Service via getblock Verbosity 2 third-party-advisory