Deno's --deny-read check does not prevent permission bypass
Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, Deno.FsFile.prototype.stat and Deno.FsFile.prototype.statSync are not limited by the permission model check --deny-read=./. It's possible to retrieve stats from files that the user do not have explicit read access to (the script is executed with --deny-read=./). Similar APIs like Deno.stat and Deno.statSync require allow-read permission, however, when a file is opened, even with file-write only flags and deny-read permission, it's still possible to retrieve file stats, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
denocrates.io | < 2.5.3 | 2.5.3 |
Affected products
2Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-qq26-84mh-26j9ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-61786ghsaADVISORY
- github.com/denoland/deno/commit/1ab2268c0bcbf9b0468e0e36963f77f8c31c73ecghsax_refsource_MISCWEB
- github.com/denoland/deno/pull/30876ghsax_refsource_MISCWEB
- github.com/denoland/deno/releases/tag/v2.2.15ghsax_refsource_MISCWEB
- github.com/denoland/deno/releases/tag/v2.5.3ghsax_refsource_MISCWEB
- github.com/denoland/deno/security/advisories/GHSA-qq26-84mh-26j9ghsax_refsource_CONFIRMWEB
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