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TI-2026-36569 Aliases CVE-2026-49411GHSA-v8fw-85r8-5m23

Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks

Priority MEDIUM 62CWE-284Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.0, the Node.js compatibility TCP path checked the permission against the original hostname string before resolution and then did not re-check after resolution. A caller could therefore pass a numeric alias of an IP address (for example the decimal integer 2130706433 or the hex form 0x7f000001, both of which resolve to 127.0.0.1) and reach the denied destination through node:net.connect or node:http.request's { host, port } options form. This vulnerability is fixed in 2.8.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00158 4th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed deno (denoland): 2.8.0deno (crates.io): 2.8.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
denolanddenobefore 2.8.02.8.0Patch availableCNA
—deno (crates.io)before 2.8.02.8.0Patch availableGHSA-v8fw-85r8-5m23
  • deno Vendordenoland Affected before 2.8.0 Fixed in 2.8.0 Patch available CNA
  • deno (crates.io) Vendor— Affected before 2.8.0 Fixed in 2.8.0 Patch available GHSA-v8fw-85r8-5m23

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*2.7.14 to before 2.8.0Vulnerabledenoland
  • cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:* Versions 2.7.14 to before 2.8.0 Vulnerable ·denoland

Remediation

  • Fix · CNA deno (denoland) Fixed in 2.8.0
  • Fix · GHSA-v8fw-85r8-5m23 deno (crates.io) Fixed in 2.8.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49411
  2. 2026-10-03 Alias added: GHSA-v8fw-85r8-5m23

References

Exploit 1

Advisory 1

Other 1

  • TI-2026-21627 Deno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_process CVSS 3.1CRITICAL 9.8
  • TI-2025-17782 Deno's AES GCM authentication tags are not verified CVSS 4.0HIGH 7.7
  • TI-2024-18537 *const c_void / ExternalPointer unsoundness leading to use-after-free CVSS 3.1HIGH 8.8
  • TI-2024-18536 Deno arbitrary file descriptor close via `op_node_ipc_pipe()` leading to permission prompt bypass CVSS 3.1HIGH 8.8
  • TI-2023-12990 Deno is vulnerable to interactive `run` permission prompt spoofing via improper ANSI neutralization CVSS 3.1HIGH 8.8
  • TI-2023-11328 Regular expression denial of service in deno CVSS 3.1HIGH 7.5
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences