What is CVE-2026-49411?

CVE-2026-49411 is a medium-severity vulnerability in Deno, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-06-23.

How severe is CVE-2026-49411?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Deno

CVE-2026-49411

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 calle…

EPSS: 0.001 (4.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Deno
Denoland Deno — versions < 2.8.0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2026-49411?: CVE-2026-49411 is a medium-severity vulnerability in Deno, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-06-23.
How severe is CVE-2026-49411?: Medium severity. CVSS v3 base score is 6.5 out of 10.