Summary
Workarounds
No workaround is available for this issue.
Impact
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.
The application assigns, modifies, tracks, or checks privileges incorrectly, allowing a user to gain elevated access. Typical impact: privilege escalation beyond the intended level.
CVE-2023-33966 has a CVSS score of 8.6 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.34.1, 0.115.0); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
This problem has been patched in Deno v1.34.1 and all users are recommended to update to this version.
Frequently Asked Questions
- What is CVE-2023-33966? CVE-2023-33966 is a high-severity improper privilege management vulnerability in deno (rust), affecting versions = 1.34.0. It is fixed in 1.34.1, 0.115.0. The application assigns, modifies, tracks, or checks privileges incorrectly, allowing a user to gain elevated access.
- How severe is CVE-2023-33966? CVE-2023-33966 has a CVSS score of 8.6 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which packages are affected by CVE-2023-33966?
deno(rust) (versions = 1.34.0)deno_runtime(rust) (versions = 0.114.0)
- Is there a fix for CVE-2023-33966? Yes. CVE-2023-33966 is fixed in 1.34.1, 0.115.0. Upgrade to this version or later.
- Is CVE-2023-33966 exploitable, and should I be worried? Whether CVE-2023-33966 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2023-33966 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2023-33966?
- Upgrade
denoto 1.34.1 or later - Upgrade
deno_runtimeto 0.115.0 or later
- Upgrade