Vulnerability details
CVE-2026-22864
denoland deno
Deno has an incomplete fix for command-injection prevention on Windows — case-insensitive extension bypass
CVSS 3.1
8.1High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| denoland | deno | < 2.5.6 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://github.com/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6 x_refsource_CONFIRM
- https://github.com/denoland/deno/releases/tag/v2.5.6 x_refsource_MISC
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Details
- Published
- 2026-01-16
- Last updated
- 2026-01-16
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.67%
Probability of exploitation in 30 days
52.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')