CVE-2026-123557
Zebra zebrad before 7.0.0 Reachable Assertion DoS via Peer Disconnection
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
ZcashFoundation Zebra zebrad before 7.0.0 contains a reachable assertion race condition that allows unauthenticated remote peers to abort the node by triggering disconnection during a blocked outbound send. Malicious peers can return empty FindBlocks or FindHeaders replies and stop reading their socket, dropping an unresolved MustUseClientResponseSender and terminating syncing nodes.
| CWE | CWE-617 |
| Vendor | zcashfoundation |
| Product | zebra |
| Published | Nov 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ZcashFoundation / zebra
0 < 7.0.0
References
Credits
🔍 SphereDonout conradoplg mpguerra