CVE-2026-22864Public exploitNetwork attack vector

Command injection via case-sensitive extension check

Published Jan 15, 2026 · Updated Jan 15, 2026

Command injection in Deno before 2.5.6 allows remote attackers to execute commands through mixed-case Windows batch-file extensions. The Windows spawn-path guard compares extensions case-sensitively with lowercase .bat and .cmd literals, so .BAT or .Bat paths evade rejection. Exploitation requires an application to pass attacker-controlled arguments to a spawned batch file; shell metacharacters in those arguments execute additional Windows commands.

CVSS severity8.1
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Deno before 2.5.6 allows remote attackers to execute commands through mixed-case Windows batch-file extensions. The Windows spawn-path guard compares extensions case-sensitively with lowercase .bat and .cmd literals, so .BAT or .Bat paths evade rejection. Exploitation requires an application to pass attacker-controlled arguments to a spawned batch file; shell metacharacters in those arguments execute additional Windows commands.

The record

CVE
CVE-2026-22864
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Deno Land Inc.
Product
Deno
Classifications
CWE-77, T1059.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.5.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Deno Land Inc. · Denoversion=< 2.5.6

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.003Windows Command Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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