Improper access control in Deno - CVE-2025-48888
Published: April 23, 2026
Vulnerability identifier: #VU127056
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-48888
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Deno Land
Affected software:
Deno
Deno
Detailed vulnerability description
The vulnerability allows a remote user to bypass read permission restrictions.
The vulnerability exists due to improper access control in the permission flag handling logic when processing combined --allow-read and --deny-read flags. A remote user can run code with this flag combination to bypass read permission restrictions.
This issue also affects other global unary permission flag combinations specified as --allow-* together with --deny-*.
How to mitigate CVE-2025-48888
Install security update from vendor's website.