How severe is CVE-2026-49411?

CVE-2026-49411 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-49411 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49411?

CVE-2026-49411 affects Deno. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49411?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-49411 have an EU (EUVD) identifier?

Yes. CVE-2026-49411 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38544.

When was CVE-2026-49411 published?

CVE-2026-49411 was published on 2026-06-23 and last updated on 2026-06-26.

CVE-2026-49411

CVE-2026-49411 is a medium-severity vulnerability in Deno with a CVSS 3.x base score of 6.5. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38544
Weakness: CWE-284
Affected product: Deno
Published: 2026-06-23
Last modified: 2026-06-26

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.0, the Node.js compatibility TCP path checked the permission against the original hostname string before resolution and then did not re-check after resolution. A caller could therefore pass a numeric alias of an IP address (for example the decimal integer 2130706433 or the hex form 0x7f000001, both of which resolve to 127.0.0.1) and reach the denied destination through node:net.connect or node:http.request's { host, port } options form. This vulnerability is fixed in 2.8.0.

Frequently asked questions

What is CVE-2026-49411?: Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.0, the Node.js compatibility TCP path checked the permission against the original hostname string before resolution and then did not re-check after resolution. A caller could therefore pass a numeric alias of an IP address (for example the decimal integer 2130706433 or the hex form 0x7f000001, both of which resolve to 127.0.0.1) and reach the denied destination through node:net.connect or node:http.request's { host, port } options form. This vulnerability is fixed in 2.8.0.
How severe is CVE-2026-49411?: CVE-2026-49411 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-49411 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49411?: CVE-2026-49411 affects Deno. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49411?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-49411 have an EU (EUVD) identifier?: Yes. CVE-2026-49411 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38544.
When was CVE-2026-49411 published?: CVE-2026-49411 was published on 2026-06-23 and last updated on 2026-06-26.

References

https://github.com/denoland/deno/security/advisories/GHSA-v8fw-85r8-5m23

Affected products (1)

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

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