# ZcashFoundation zebrad denial of service in z_listunifiedreceivers

Source: https://junglewise.ai/threats/zcashfoundation-zebrad-denial-of-service-in-z-listunifiedreceivers-d7538689  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-02. Updated: 2026-07-02  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 6.5 · Published 2026-07-02

Zebra, a Zcash node implementation, is vulnerable to a denial-of-service attack that can completely shut down the node. An attacker with access to the node's remote control interface (RPC) can send a specially crafted address that causes the software to crash. This can be used to keep a node offline indefinitely, disrupting cryptocurrency operations such as mining or wallet services.

Technologies: [zebra-rpc (crates.io)](https://junglewise.ai/threats/technologies/zebra-rpc), [zebrad (crates.io)](https://junglewise.ai/threats/technologies/zebrad). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Medium severity, with a CVSS score of 6.5, published 2 July 2026.

**Which products and versions are affected?** zebra-rpc (crates.io) <= 7.0.0; zebrad (crates.io) <= 4.4.1.

**Is there a fix for This vulnerability?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is This vulnerability attacked?** It is attacked over the network, in a hosted service.

**Am I affected?** Check whether you run zebra-rpc (crates.io) or zebrad (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The z_listunifiedreceivers RPC handler in zebrad contains a reachable assertion (panic) when processing a structurally valid but cryptographically invalid Unified Address. Specifically, the handler calls .expect() on a result from sapling_crypto::PaymentAddress::from_bytes that returns None for non-subgroup Jubjub points. Because the Zebra release profile is configured with panic = 'abort', this terminates the entire node process. An authenticated attacker (or unauthenticated if cookie auth is disabled) can trigger this via a network request to the RPC endpoint. The issue is fixed in zebrad v4.5.0 and zebra-rpc v8.0.0 by implementing proper error handling instead of a panic.

## Affected products

- ZcashFoundation zebrad <= 4.4.1
- ZcashFoundation zebra-rpc <= 7.0.0

## Timeline

- 2026-05-29: disclosed: Initial report via private GitHub Security Advisory
- 2026-07-02: advisory: Public advisory published

## References

- [https://api.github.com/users/robustfengbin](https://api.github.com/users/robustfengbin)
- [https://github.com/robustfengbin](https://github.com/robustfengbin)
- [https://api.github.com/users/robustfengbin/gists%7B/gist_id%7D](https://api.github.com/users/robustfengbin/gists%7B/gist_id%7D)
- [https://api.github.com/users/robustfengbin/repos](https://api.github.com/users/robustfengbin/repos)
- [https://avatars.githubusercontent.com/u/4393632?v=4](https://avatars.githubusercontent.com/u/4393632?v=4)
- [https://api.github.com/users/robustfengbin/events%7B/privacy%7D](https://api.github.com/users/robustfengbin/events%7B/privacy%7D)

## Related threats

- [ZcashFoundation Zebra assertion panic in address book mempool update](https://junglewise.ai/threats/cve-2026-52829-zcashfoundation-zebra-assertion-panic-in-address-book-mempool)
- [ZcashFoundation Zebra process abort via repeated shielded transactions](https://junglewise.ai/threats/cve-2026-52739-zcashfoundation-zebra-process-abort-via-repeated-shielded)
- [ZcashFoundation Zebra denial of service via balance overflow in state writer](https://junglewise.ai/threats/cve-2026-52738-zcashfoundation-zebra-denial-of-service-via-balance-overflow-in)
- [Zcash Zebra sync restart poisoning via above-lookahead block](https://junglewise.ai/threats/cve-2026-52737-zcash-zebra-sync-restart-poisoning-via-above-lookahead-block)
- [ZcashFoundation Zebra block suppression via same-header body poisoning](https://junglewise.ai/threats/cve-2026-52736-zcashfoundation-zebra-block-suppression-via-same-header-body)