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CVE-2026-22864

Deno command injection

8.1 HIGHPublic exploitEPSS 0.68%
  1. Published15 Jan 2026

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.5.6, a prior patch aimed to block spawning Windows batch/shell files by returning an error when a spawned path’s extension matched .bat or .cmd. That check performs a case-sensitive comparison against lowercase literals and therefore can be bypassed when the extension uses alternate casing (for example .BAT, .Bat, etc.). This vulnerability is fixed in 2.5.6.

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< 2.5.6

Remediation

Fixed in
Deno≥ 2.5.6

References

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Frequently asked

Is CVE-2026-22864 being actively exploited?

CVE-2026-22864 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.68%.

How severe is CVE-2026-22864?

CVE-2026-22864 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.68% probability of exploitation.

Which products are affected by CVE-2026-22864?

Affected products include Deno.

How do I fix CVE-2026-22864?

Upgrade affected software to a fixed version, for example Deno 2.5.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-22864 against the real software inventory on every managed device, every day. 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.