denoland deno up to 2.7.11 Resolver package.json path traversal

Summaryinfo

A vulnerability was found in denoland deno up to 2.7.11 and classified as critical. The impacted element is an unknown function of the file package.json of the component Resolver. Executing a manipulation can lead to path traversal. This vulnerability is handled as CVE-2026-49406. It is possible to launch the attack on the local host. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in denoland deno up to 2.7.11. This vulnerability affects an unknown code of the file package.json of the component Resolver. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

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_modules// directory. A malicious package.json whose main field contained .. segments was able to resolve to an arbitrary path on disk, and the resolver then read that file without consulting the --allow-read allowlist. This let a require("evil-pkg") call return the contents of a file that a direct Deno.readTextFileSync(...) call would have been blocked from reading. This vulnerability is fixed in 2.7.12.

The advisory is available at github.com. This vulnerability was named CVE-2026-49406 since 05/29/2026. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

By approaching the search of inurl:package.json it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.7.12 eliminates this vulnerability.

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Productinfo

Vendor

• denoland

Name

• deno

Version

• 2.7.0
• 2.7.1
• 2.7.2
• 2.7.3
• 2.7.4
• 2.7.5
• 2.7.6
• 2.7.7
• 2.7.8
• 2.7.9
• 2.7.10
• 2.7.11

Website

• Product: https://github.com/denoland/deno/

CPE 2.3info

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CPE 2.2info

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