How severe is CVE-2026-22864?

CVE-2026-22864 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-22864 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22864?

CVE-2026-22864 affects Deno. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22864?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-22864 have an EU (EUVD) identifier?

Yes. CVE-2026-22864 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2935.

When was CVE-2026-22864 published?

CVE-2026-22864 was published on 2026-01-15 and last updated on 2026-06-17.

CVE-2026-22864

CVE-2026-22864 is a high-severity vulnerability in Deno with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2935
Weakness: CWE-77
Affected product: Deno
Published: 2026-01-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-22864?: 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.
How severe is CVE-2026-22864?: CVE-2026-22864 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-22864 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22864?: CVE-2026-22864 affects Deno. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22864?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-22864 have an EU (EUVD) identifier?: Yes. CVE-2026-22864 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2935.
When was CVE-2026-22864 published?: CVE-2026-22864 was published on 2026-01-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*

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