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CVE-2026-49402

Deno command injection

8.1 HIGHPublic exploitEPSS 0.45%
  1. Published23 Jun 2026

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.10, Deno's node:child_process implementation provided an escapeShellArg() helper used when callers passed shell: true to spawn / spawnSync / exec and friends. On Windows, the helper failed to quote arguments that contained cmd.exe metacharacters and did not neutralize % (which cmd.exe expands even inside double-quoted strings). An attacker who controlled any portion of an argument passed to such a call could inject arbitrary additional commands into the spawned cmd.exe invocation. This vulnerability is fixed in 2.7.10.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Deno< 2.7.10

Remediation

Fixed in
Deno≥ 2.7.10

References

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Frequently asked

Is CVE-2026-49402 being actively exploited?

CVE-2026-49402 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.45%.

How severe is CVE-2026-49402?

CVE-2026-49402 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.45% probability of exploitation.

Which products are affected by CVE-2026-49402?

Affected products include Deno.

How do I fix CVE-2026-49402?

Upgrade affected software to a fixed version, for example Deno 2.7.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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