How severe is CVE-2026-49402?

CVE-2026-49402 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-2026-49402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49402?

CVE-2026-49402 affects Deno. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49402?

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-2026-49402 have an EU (EUVD) identifier?

Yes. CVE-2026-49402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38546.

When was CVE-2026-49402 published?

CVE-2026-49402 was published on 2026-06-23 and last updated on 2026-06-26.

CVE-2026-49402

CVE-2026-49402 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-78.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38546
Weakness: CWE-78
Affected product: Deno
Published: 2026-06-23
Last modified: 2026-06-26

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.10, Deno's node:child_process implementation provided an escapeShellArg() helper used when callers passed shell: true to spawn / spawnSync / exec and friends. On Windows, the helper failed to quote arguments that contained cmd.exe metacharacters and did not neutralize % (which cmd.exe expands even inside double-quoted strings). An attacker who controlled any portion of an argument passed to such a call could inject arbitrary additional commands into the spawned cmd.exe invocation. This vulnerability is fixed in 2.7.10.

Frequently asked questions

What is CVE-2026-49402?: Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.10, Deno's node:child_process implementation provided an escapeShellArg() helper used when callers passed shell: true to spawn / spawnSync / exec and friends. On Windows, the helper failed to quote arguments that contained cmd.exe metacharacters and did not neutralize % (which cmd.exe expands even inside double-quoted strings). An attacker who controlled any portion of an argument passed to such a call could inject arbitrary additional commands into the spawned cmd.exe invocation. This vulnerability is fixed in 2.7.10.
How severe is CVE-2026-49402?: CVE-2026-49402 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-2026-49402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49402?: CVE-2026-49402 affects Deno. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49402?: 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-2026-49402 have an EU (EUVD) identifier?: Yes. CVE-2026-49402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38546.
When was CVE-2026-49402 published?: CVE-2026-49402 was published on 2026-06-23 and last updated on 2026-06-26.

References

https://github.com/denoland/deno/security/advisories/GHSA-7xh3-mhg9-jcw8

Affected products (1)

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

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