CVE-2026-49401
HIGHDescription
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.14, Deno's permission system enforces filesystem and execution restrictions by comparing the requested path against the path supplied to --deny-read, --deny-write, --deny-run, or --deny-ffi. On macOS, that comparison was done at the raw-byte level while the APFS filesystem treats different Unicode spellings of the same name as the same file. That means a program could reach a denied path by spelling it differently than the deny rule. This vulnerability is fixed in 2.7.14.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 8% of all known CVEs.
References
Related Vulnerabilities
Other CWE-41 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2025-21269 | Medium | 4.3 | 4.6% | - | Fix |
| CVE-2025-21247 | Medium | 4.3 | 3.2% | - | Fix |
| CVE-2025-21219 | Medium | 4.3 | 3.0% | - | Fix |
| CVE-2025-21189 | Medium | 4.3 | 3.0% | - | Fix |
| CVE-2024-30036 | Medium | 6.5 | 2.3% | - | Fix |
| CVE-2025-21268 | Medium | 4.3 | 2.0% | - | Fix |
Common questions
How do I fix CVE-2026-49401?
Upgrade Deno to 2.7.14 or later.
Is CVE-2026-49401 being actively exploited?
Not that we know of. CVE-2026-49401 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.19% is the estimated probability that it will be exploited in the next 30 days. That is higher than 8% of all scored CVEs.
How severe is CVE-2026-49401?
CVE-2026-49401 has a CVSS v3 base score of 7.3, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-49401 affect?
Published advisories record a fix for Deno (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-49401
Markdown
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TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-26.