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CVE-2026-55428
Published:July 07, 2026
Updated:July 21, 2026
Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, the tailnet coordinator validates that an agent's "Addresses" derive from its authenticated UUID but applies no equivalent check to "AllowedIPs". The coordinator forwards agent-supplied "AllowedIPs" verbatim to tunnel peers which install them into the WireGuard peer configuration. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 validates each "AllowedIPs" prefix against the authenticating agent's UUID just like "Addresses". As a workaround, monitor coordinator logs for agents advertising unexpected "AllowedIPs" prefixes.
Affected Packages
https://github.com/coder/coder.git (GITHUB):
Affected version(s) >=v2.34.0 <v2.34.2
Fix Suggestion:
Update to version v2.34.2
https://github.com/coder/coder.git (GITHUB):
Affected version(s) >=v2.30.0 <v2.32.7
Fix Suggestion:
Update to version v2.32.7
https://github.com/coder/coder.git (GITHUB):
Affected version(s) >=v2.33.0 <v2.33.8
Fix Suggestion:
Update to version v2.33.8
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.30.0 <v2.32.7
Fix Suggestion:
Update to version v2.32.7
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.34.0 <v2.34.2
Fix Suggestion:
Update to version v2.34.2
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.33.0 <v2.33.8
Fix Suggestion:
Update to version v2.33.8
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CVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Incorrect Authorization
Improper Authorization
EPSS
Base Score:
0.40