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TI-2026-66070 Aliases CVE-2026-104427GHSA-3c42-fjf2-4p66

Zebra before 6.1.0 Chain Stall via Stale parent_error_map Entry

Priority LOW 35CWE-459Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00308 23rd percentileScored 2026-11-07
Fix Fixed zebra (ZcashFoundation): 6.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ZcashFoundationzebrabefore 6.1.06.1.0Patch availableCNA
  • zebra VendorZcashFoundation Affected before 6.1.0 Fixed in 6.1.0 Patch available CNA

Remediation

  • Fix · CNA zebra (ZcashFoundation) Fixed in 6.1.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    ZcashFoundation zebra 6.1.0

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-66068 Zebra before 6.1.0 Batch-Verification Poisoning DoS via Unattributed Pushed TransactionsPriority LOW 36
    • TI-2026-66069 Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value CheckPriority LOW 35
    • TI-2026-66067 Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplatePriority LOW 28
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-104427
  2. 2026-10-03 Alias added: GHSA-3c42-fjf2-4p66
  3. 2026-10-04 Priority changed: MEDIUM → LOW
  4. 2026-10-05 CISA SSVC decision points changed

References

Advisory 1

  • TI-2026-66079 Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missing-Output Handling CVSS 4.0HIGH 8.3
  • TI-2026-37850 ZEBRA: Mempool transaction admission denial via single-peer inbound queue saturation CVSS 3.1MEDIUM 5.3
  • TI-2026-71182 Improper block validation in Zebra gossip lets peers drop new blocks CVSS 4.0MEDIUM 6.3
  • TI-2026-29537 Zebra: addr/addrv2 Deserialization Resource Exhaustion CVSS 4.0MEDIUM 6.3
  • TI-2026-30136 ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling CVSS 4.0CRITICAL 9.3
  • TI-2026-37853 ZEBRA: Consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser CVSS 4.0CRITICAL 9.3
See all 44 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences