Improper access control in Deno - CVE-2025-48888
Published: April 23, 2026
Vulnerability identifier: #VU127056
CSH Severity: Low
CVSS v4: 5.3 [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]
CVE-ID: CVE-2025-48888
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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-*.
Affected software
Deno
How to mitigate CVE-2025-48888
Install security update from vendor's website.
Deno - addressed in versions 2.1.13, 2.2.13