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CVE-2026-104428GHSA-x6v8-c2xp-928m

Zebra before 11.0.0 Denial of Service via getblock Verbosity 2

ZcashFoundation zebra
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.39%Chance of exploitation activity in the next 30 days, higher than 31% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in11.0.0Fixed versionCVE List
Published2 Oct 2026Updated 6 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • zebraaffected: all versions before 11.0.0CVE List
  • zebraunaffected: 11.0.0CVE List

References 2