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CVE-2026-49401

Deno vulnerability

7.3 HIGHPublic exploitEPSS 0.20%
  1. Published23 Jun 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

Affected products

Deno< 2.7.14

Remediation

Fixed in
Deno≥ 2.7.14

References

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Frequently asked

Is CVE-2026-49401 being actively exploited?

CVE-2026-49401 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.20%.

How severe is CVE-2026-49401?

CVE-2026-49401 has a CVSS 3.1 base score of 7.3, rated high. EPSS estimates a 0.20% probability of exploitation.

Which products are affected by CVE-2026-49401?

Affected products include Deno.

How do I fix CVE-2026-49401?

Upgrade affected software to a fixed version, for example Deno 2.7.14 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-49401 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.