CVE-2026-55428
Last modified
CVE-2026-55428 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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`. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Coder | Coder | < 2.29.17 |
| Coder | Coder | >= 2.30.0, < 2.32.7 |
| Coder | Coder | >= 2.33.0, < 2.33.8 |
| Coder | Coder | >= 2.34.0, < 2.34.2 |
References
- https://github.com/coder/coder/pull/26144Issue Tracking, Patch
- https://github.com/coder/coder/releases/tag/v2.29.17Release Notes
- https://github.com/coder/coder/releases/tag/v2.32.7Release Notes
- https://github.com/coder/coder/releases/tag/v2.33.8Release Notes
- https://github.com/coder/coder/releases/tag/v2.34.2Release Notes
- https://github.com/coder/coder/security/advisories/GHSA-wrq8-fcv5-8hvpPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-55428?
How severe is CVE-2026-55428?
How do I fix CVE-2026-55428?
How Strix Helps
- Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-55418FastGPT is an open source AI knowledge base platform. Prior …8.6
- CVE-2026-5542A vulnerability was determined in code-projects Simple Laund…4.3
- CVE-2026-55420Discourse is an open-source discussion platform. Prior to 20…8.1
- CVE-2026-55423Langflow is a tool for building and deploying AI-powered age…6.1
- CVE-2026-55424Discourse is an open-source discussion platform. Prior to 20…5.4
- CVE-2026-55427Coder allows organizations to provision remote development e…8.3
- CVE-2026-55429Coder allows organizations to provision remote development e…8.7
- CVE-2026-5543A vulnerability was identified in PHPGurukul User Registrati…6.3
- CVE-2026-55430Coder allows organizations to provision remote development e…6.8
- CVE-2026-55431Coder allows organizations to provision remote development e…6.1
- CVE-2026-55432Coder allows organizations to provision remote development e…5.4
- CVE-2026-55433Coder allows organizations to provision remote development e…5.4
Are you affected by CVE-2026-55428?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST