CVE-2023-33966

Name: CVE-2023-33966
Creator: NVD / NIST
Published: 2023-05-31T18:15:09.527+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.63%

Last modified Jun 17, 2026

CVE-2023-33966 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Deno is a runtime for JavaScript and TypeScript. In deno 1.34.0 and deno_runtime 0.114.0, outbound HTTP requests made using the built-in `node:http` or `node:https` modules are incorrectly not checked against the network permission allow list (`--allow-net`). EPSS estimates a 0.63% chance of exploitation in the next 30 days.

Description

Deno is a runtime for JavaScript and TypeScript. In deno 1.34.0 and deno_runtime 0.114.0, outbound HTTP requests made using the built-in `node:http` or `node:https` modules are incorrectly not checked against the network permission allow list (`--allow-net`). Dependencies relying on these built-in modules are subject to the vulnerability too. Users of Deno versions prior to 1.34.0 are unaffected. Deno Deploy users are unaffected. This problem has been patched in Deno v1.34.1 and deno_runtime 0.114.1 and all users are recommended to update to this version. No workaround is available for this issue.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.63%

45.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Deno	Deno	1.34.0
Deno	Deno Runtime	0.114.0

References

https://github.com/denoland/deno/releases/tag/v1.34.1Release Notes
https://github.com/denoland/deno/security/advisories/GHSA-vc52-gwm3-8v2fVendor Advisory
https://github.com/denoland/deno/releases/tag/v1.34.1Release Notes
https://github.com/denoland/deno/security/advisories/GHSA-vc52-gwm3-8v2fVendor Advisory

Timeline

Published: May 31, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-33966?

How severe is CVE-2023-33966?

CVE-2023-33966 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.

How do I fix CVE-2023-33966?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-33966?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST