CVE-2026-123557
Published:November 08, 2026
Updated:November 09, 2026
ZcashFoundation Zebra zebrad before 7.0.0 contains a reachable assertion race condition that allows unauthenticated remote peers to abort the node by triggering disconnection during a blocked outbound send. Malicious peers can return empty FindBlocks or FindHeaders replies and stop reading their socket, dropping an unresolved MustUseClientResponseSender and terminating syncing nodes.
Affected Packages
https://github.com/ZcashFoundation/zebra.git (GITHUB):
Affected version(s) >=v1.0.0-alpha.1 <v7.0.0 || >=v2.0.0-rc.0 <v7.0.0 || >=v3.0.0-rc.0 <v7.0.0 || >=v4.0.0 <v7.0.0 || >=v5.0.0 <v7.0.0 || >=v6.0.0-rc.0 <v7.0.0 || =v7.0.0-rc.0 <v7.0.0Fix Suggestion:
Update to version v7.0.0zebra-network (RUST):
Affected version(s) =11.0.0 <15.0.0 || =14.0.0 <15.0.0 || =3.0.0 <15.0.0 || >=5.0.0 <15.0.0 || >=2.0.0 <15.0.0 || =9.0.0 <15.0.0 || =13.0.0 <15.0.0 || =12.0.0 <15.0.0 || >=1.0.0-beta.25 <15.0.0 || =7.0.0 <15.0.0 || =4.0.0 <15.0.0 || >=10.0.0 <15.0.0 || =8.0.0 <15.0.0 || =6.0.0 <15.0.0Fix Suggestion:
Update to version 15.0.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Reachable Assertion
EPSS
Base Score:
0.31