CVE-2026-104432GHSA-h8m8-844p-v3m9
Zebra before 6.3.0 False Readiness via Discarded One-Hash FindBlocks Response
ZcashFoundation zebra
CVSS
6.9MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 22% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 6.3.0zebraCVE 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 6.3.0 contains an improper exceptional condition check in ChainSync::obtain_tips that discards valid one-hash FindBlocks responses, falsely reporting close-to-tip status. Peers returning only the next block hash cause a zero-length sync sample, making the /ready endpoint return 200 OK while the node remains behind the tip.
Text from CVE List
Affected versions 2
- zebraaffected: all versions before 6.3.0CVE List
- zebraunaffected: 6.3.0CVE List