Auth bypass in Deno
CVE-2025-48888
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Starting in version 1.41.3 and prior to versions 2.1.13, 2.2.13, and 2.3.2, `deno run --allow-read --deny-read main.ts` results in allowed, even though 'deny' should be stronger. The result is the same with all global unary permissions given as `--allow-* --deny-*`. This only affects a nonsensical combination of flags, so there shouldn't be a real impact on the userbase. Users may upgrade to version 2.1.13, 2.2.13, or 2.3.2 to receive a patch.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Deno
- Denoland Deno — versions >= 1.41.3, < 2.1.13, >= 2.2.0, < 2.2.13, >= 2.3.0, < 2.3.2
Weakness classification (CWE)
References
- github.com/denoland/deno/security/advisories/GHSA-xqxc-x6p3-w683 (Exploit, Vendor Advisory)
- github.com/denoland/deno/pull/22894 (Patch, Issue Tracking)
- github.com/denoland/deno/pull/29213 (Patch, Issue Tracking)
- github.com/denoland/deno/commit/2f0fae9d9071dcaf0a689bc7097584b1b9ebc8db (Patch)
- github.com/denoland/deno/commit/9d665572d3cd39f997e29e6daac7c1102fc5c04f (Patch)
- github.com/denoland/deno/commit/ef315b56c26c9ef5f25284a5100d2ed525a148cf (Patch)
Frequently asked questions
- What is CVE-2025-48888?
- CVE-2025-48888 is a medium-severity vulnerability in Deno, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2025-06-04.
- How severe is CVE-2025-48888?
- Medium severity. CVSS v3 base score is 5.3 out of 10.