CVE-2026-104434: Zebra before 8.0.0 Denial of Service via z_listunifiedreceivers RPC
ZcashFoundation Zebra zebra-rpc before 8.0.0 and zebrad before 4.5.0 contain a reachable assertion in the zlistunifiedreceivers RPC handler, which calls expect() on Sapling receiver parsing that fails for Unified Addresses carrying invalid Jubjub points. Authenticated RPC clients can submit such an address to abort the zebrad process, repeatably keeping the node offline.
Affected Software
Event History
Frequently Asked Questions
Which deployments are exposed to this denial of service?
Deployments running Zebra zebra-rpc before 8.0.0 or zebrad before 4.5.0 are exposed if an authenticated client can access the RPC service and invoke z_listunifiedreceivers.
What access does an attacker need to trigger the crash?
The attacker needs authenticated RPC access. They can submit a Unified Address containing an invalid Jubjub point to the z_listunifiedreceivers RPC handler, causing zebrad to abort.
Can the issue be used to keep a node offline?
Yes. The process abort can be triggered repeatedly by an authenticated RPC client, allowing the client to repeatedly take the zebrad node offline.