CVE-2026-104434 Zebra before 8.0.0 Denial of Service via z_listunifiedreceivers RPC
Authenticated RPC clients can crash the Zcash node by submitting invalid Unified Addresses, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104434?
CVE-2026-104434 is a high-severity denial of service vulnerability in ZcashFoundation zebra, published on 2 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
ZcashFoundation Zebra zebra-rpc before 8.0.0 and zebrad before 4.5.0 contain a reachable assertion in the z_listunifiedreceivers 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.
Weakness: CWE-617
Which versions are affected by CVE-2026-104434?
4 open source packages ship an affected version, including zebra-rpc and zebrad.
| Package | Affected | Fixed in |
|---|---|---|
zebra-rpc crates.io | All versions | 8.0.0 |
zebra-rpc crates.io | All versions | 8.0.0 |
zebrad crates.io | All versions | 4.5.0 |
zebrad crates.io | All versions | 4.5.0 |
How do I fix CVE-2026-104434?
Upgrade zebra-rpc to 8.0.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-104434 being exploited?
There is no known exploitation of CVE-2026-104434 in the wild and no public exploit code.
Sources
Also known as GHSA-c8w6-x74f-vmg3, GHSA-fxgv-g76m-8hg2.