Deno's --deny-write check does not prevent permission bypass
Published Oct 8, 2025
3.3
LOWCVSS 3.1
EPSS 0.20%
Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.
Affected products
-
- Version < 2.2.15StatusaffectedConstraints-
- Version >= 2.3.0, < 2.5.3StatusaffectedConstraints-
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (8)
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-31878 Advisory
- https://github.com/advisories/GHSA-vg2r-rmgp-cgqj Advisory
- https://github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b x_refsource_MISCPatch
- https://github.com/denoland/deno/pull/30872 x_refsource_MISCIssue TrackingPatch
- https://github.com/denoland/deno/releases/tag/v2.2.15 x_refsource_MISCRelease Notes
- https://github.com/denoland/deno/releases/tag/v2.5.3 x_refsource_MISCRelease Notes
- https://github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj x_refsource_CONFIRMExploitVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-61785
| Link | Providers | Tags |
|---|---|---|
| https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-31878 | Advisory | |
| https://github.com/advisories/GHSA-vg2r-rmgp-cgqj | Advisory | |
| https://github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b | x_refsource_MISCPatch | |
| https://github.com/denoland/deno/pull/30872 | x_refsource_MISCIssue TrackingPatch | |
| https://github.com/denoland/deno/releases/tag/v2.2.15 | x_refsource_MISCRelease Notes | |
| https://github.com/denoland/deno/releases/tag/v2.5.3 | x_refsource_MISCRelease Notes | |
| https://github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj | x_refsource_CONFIRMExploitVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2025-61785 |
Change history (0)
No recorded changes yet.