Is CVE-2026-55428 actively exploited?

No active exploitation of CVE-2026-55428 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55428 be exploited remotely?

Yes. CVE-2026-55428 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-55428?

CVE-2026-55428 has a CVSS score of 8.2 (HIGH).

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HIGH

CVE-2026-55428

CWE-285Published: July 8, 2026· Updated: Jul 8, 2026

8.2

CVSS v3.1

EPSS:0.40%probability of exploitation in 30 daysPercentile:32.5th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-55428 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.2.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.