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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
coder coder affected
Version Status Constraints
>= 2.34.0, < 2.34.2 affected —
>= 2.33.0, < 2.33.8 affected —
>= 2.30.0, < 2.32.7 affected —
< 2.29.17 affected —

No data.

No data.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-wrq8-fcv5-8hvp Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/coder/coder/pull/26144 cve-icon
https://github.com/coder/coder/releases/tag/v2.29.17 cve-icon
https://github.com/coder/coder/releases/tag/v2.32.7 cve-icon
https://github.com/coder/coder/releases/tag/v2.33.8 cve-icon
https://github.com/coder/coder/releases/tag/v2.34.2 cve-icon
https://github.com/coder/coder/security/advisories/GHSA-wrq8-fcv5-8hvp cve-icon
History

Wed, 08 Jul 2026 02:15:00 +0000

Type Values Removed Values Added
First Time appeared Coder
Coder coder
Vendors & Products Coder
Coder coder

Wed, 08 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
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.
Title Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator
Weaknesses CWE-285
CWE-863
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-07T23:57:45.338Z

Reserved: 2026-06-16T21:59:57.016Z

Link: CVE-2026-55428

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-08T02:00:12Z

Weaknesses