CVE-2026-104434: Reachable Assertion in ZcashFoundation zebra
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.
AI Analysis
Technical Summary
The vulnerability exists in the z_listunifiedreceivers RPC handler of zebra-rpc (before 8.0.0) and zebrad (before 4.5.0). It triggers a reachable assertion failure when parsing Sapling receivers from Unified Addresses that carry invalid Jubjub points. This assertion failure causes the zebrad process to abort. Since the RPC interface requires authentication, an authenticated client can exploit this to repeatedly crash the node, causing a denial of service condition.
Potential Impact
An authenticated RPC client can cause the zebrad node process to abort by submitting malformed Unified Addresses with invalid Jubjub points. This results in a denial of service by keeping the node offline repeatedly. There is no indication of remote code execution or data compromise from the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict RPC client access to trusted users only to prevent exploitation. Monitor for updates from ZcashFoundation regarding official patches or mitigations.
CVE-2026-104434: Reachable Assertion in ZcashFoundation zebra
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.
CVSS v4.0
Score 7.1high
Affected software
ZcashFoundation
zebra
ZcashFoundation
zebra
pkg:github/zcashfoundation/zebra-rpcpkg:github/zcashfoundation/zebradRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in the z_listunifiedreceivers RPC handler of zebra-rpc (before 8.0.0) and zebrad (before 4.5.0). It triggers a reachable assertion failure when parsing Sapling receivers from Unified Addresses that carry invalid Jubjub points. This assertion failure causes the zebrad process to abort. Since the RPC interface requires authentication, an authenticated client can exploit this to repeatedly crash the node, causing a denial of service condition.
Potential Impact
An authenticated RPC client can cause the zebrad node process to abort by submitting malformed Unified Addresses with invalid Jubjub points. This results in a denial of service by keeping the node offline repeatedly. There is no indication of remote code execution or data compromise from the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict RPC client access to trusted users only to prevent exploitation. Monitor for updates from ZcashFoundation regarding official patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-02T00:50:26.604Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abf99b0a43b0b3b89b26947
Added to database: 10/02/2026, 11:46:56 UTC
Last enriched: 10/02/2026, 12:02:07 UTC
Last updated: 10/03/2026, 03:07:16 UTC
Views: 15
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