CVE-2026-104427: Incomplete Cleanup in ZcashFoundation zebra
Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causing the next canonical block to be rejected and stalling the node for roughly 2,000 blocks.
AI Analysis
Technical Summary
CVE-2026-104427 affects Zebra prior to version 6.1.0. The vulnerability arises from incomplete cleanup in the state write task, enabling remote unauthenticated peers to poison the parent_error_map. By delivering a coinbase-malleated block that shares a canonical block's hash before propagation, attackers cause the subsequent canonical block to be rejected, effectively stalling node synchronization for about 2,000 blocks.
Potential Impact
The vulnerability allows remote unauthenticated attackers to stall the synchronization process of Zebra nodes by poisoning internal state, leading to rejection of legitimate canonical blocks and causing the node to stall for roughly 2,000 blocks. This can disrupt normal node operation and blockchain synchronization.
Mitigation Recommendations
A fix is available in Zebra version 6.1.0. Users should upgrade to version 6.1.0 or later to remediate this vulnerability.
CVE-2026-104427: Incomplete Cleanup in ZcashFoundation zebra
Description
Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causing the next canonical block to be rejected and stalling the node for roughly 2,000 blocks.
CVSS v4.0
Score 8.2high
Affected software
ZcashFoundation
zebra
pkg:github/zcashfoundation/zebraRun 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
CVE-2026-104427 affects Zebra prior to version 6.1.0. The vulnerability arises from incomplete cleanup in the state write task, enabling remote unauthenticated peers to poison the parent_error_map. By delivering a coinbase-malleated block that shares a canonical block's hash before propagation, attackers cause the subsequent canonical block to be rejected, effectively stalling node synchronization for about 2,000 blocks.
Potential Impact
The vulnerability allows remote unauthenticated attackers to stall the synchronization process of Zebra nodes by poisoning internal state, leading to rejection of legitimate canonical blocks and causing the node to stall for roughly 2,000 blocks. This can disrupt normal node operation and blockchain synchronization.
Mitigation Recommendations
A fix is available in Zebra version 6.1.0. Users should upgrade to version 6.1.0 or later to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-02T00:46:23.831Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abf99afa43b0b3b89b26906
Added to database: 10/02/2026, 11:46:55 UTC
Last enriched: 10/02/2026, 12:02:32 UTC
Last updated: 10/03/2026, 03:09:15 UTC
Views: 13
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