What is CVE-2026-49406?

CVE-2026-49406 is a medium-severity vulnerability in Deno, classified under Path Traversal. CVSS score: 5.5/10. Published 2026-06-23.

How severe is CVE-2026-49406?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Path Traversal in Deno

CVE-2026-49406

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.12, when Deno was run in BYONM mode (nodeModulesDir: "manual"), the module resolver did not validate that a package's resolved entrypoint stayed within its node_module…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.002 (6.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Deno
Denoland Deno — versions < 2.7.12

Weakness classification (CWE)

CWE-22 — Path Traversal

References

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

Frequently asked questions

What is CVE-2026-49406?: CVE-2026-49406 is a medium-severity vulnerability in Deno, classified under Path Traversal. CVSS score: 5.5/10. Published 2026-06-23.
How severe is CVE-2026-49406?: Medium severity. CVSS v3 base score is 5.5 out of 10.