CVE-2026-22864 json
Deno has an incomplete fix for command-injection prevention on Windows — case-insensitive extension bypass
published 2026-01-15 9 mo ago modified 2026-07-18 3 mo ago also EUVD-2026-2935 , GHSA-m3c4-prhw-mrx6 , JLSEC-2026-115
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- crates.io deno 2.5.6
- julia Deno_jll 2.6.3+0
- deno deno 2.5.6
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 9 mo ago
Exploit prediction
0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | deno | <2.5.6 |
2.5.6 |
| julia | Deno_jll | <2.6.3+0 |
2.6.3+0 |
Affected products
- denoland deno
Classification
- Weakness
-
- CWE-77 Improper Neutralization of Special Elements used in a Command
References
-
github.com
/denoland/deno/security/advisories/GHSA-m3c4-prhw-mrx6
web, exploit, vendor-advisory
-
github.com
/denoland/deno/releases/tag/v2.5.6
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-22864
advisory, web
-
github.com
/denoland/deno
package
-
github.com
/advisories/GHSA-m3c4-prhw-mrx6
web
Sources
- CVE List CVE-2026-22864
- GitHub Advisory GHSA-m3c4-prhw-mrx6
- NVD CVE-2026-22864
- OSV JLSEC-2026-115
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.