Network restriction bypass via numeric hostname aliases
Published Jun 23, 2026 · Updated Jun 23, 2026
Improper access control in Deno before 2.8.0 allows local users to reach denied IP addresses through the Node.js compatibility TCP path. TCPWrap checks --deny-net against the original host string but does not repeat the check after resolution, so numeric IPv4 aliases evade the denied-address match. Exploitation requires code execution inside a Deno process configured with --deny-net and an options-form node:net or node:http call; the primitive only reaches the protected endpoint.
Summary
What happened
Improper access control in Deno before 2.8.0 allows local users to reach denied IP addresses through the Node.js compatibility TCP path. TCPWrap checks --deny-net against the original host string but does not repeat the check after resolution, so numeric IPv4 aliases evade the denied-address match. Exploitation requires code execution inside a Deno process configured with --deny-net and an options-form node:net or node:http call; the primitive only reaches the protected endpoint.
The record
- CVE
- CVE-2026-49411
- Published
- Jun 23, 2026
- Updated
- Jun 23, 2026
- Vendor
- Deno Land Inc.
- Product
- Deno
- Classifications
- CWE-284, T1687
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 23, 2026CVE publishedPublication date reported by the CVE source.
- Jun 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.8.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA-v8fw-85r8-5m23 loopback proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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