CVE-2026-104427GHSA-8gxx-hc65-vv82
Zebra before 6.1.0 Chain Stall via Stale parent_error_map Entry
ZcashFoundation zebra
CVSS
8.2HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.31%Chance of exploitation activity in the next 30 days, higher than 22% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 6.1.0zebraCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
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.
Text from CVE List
Affected versions 2
- zebraaffected: all versions before 6.1.0CVE List
- zebraunaffected: 6.1.0CVE List