What is CVE-2023-22499?

CVE-2023-22499 is a high-severity vulnerability in Deno, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2023-01-17.

How severe is CVE-2023-22499?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Deno

CVE-2023-22499

Deno is a runtime for JavaScript and TypeScript that uses V8 and is built in Rust. Multi-threaded programs were able to spoof interactive permission prompt by rewriting the prompt to suggest that program is waiting on user confirmation to unrelated action. A malicious program could clear the terminal screen after permission prompt was shown and write a generic message. This situation impacts users who use Web Worker API and relied on interactive permission prompt. The reproduction is very timing sensitive and can’t be reliably reproduced on every try. This problem can not be exploited on systems that do not attach an interactive prompt (for example headless servers). The problem has been fixed in Deno v1.29.3; it is recommended all users update to this version. Users are advised to upgrade. Users unable to upgrade may run with --no-prompt flag to disable interactive permission prompts.

Vulnerability class: Race Condition

Published 2023-01-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Deno
Denoland Deno — versions >= 1.9, < 1.29.3

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

github.com/denoland/deno/security/advisories/GHSA-mc52-jpm2-cqh6 (Exploit, Third Party Advisory)
github.com/denoland/deno/pull/17392 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2023-22499?: CVE-2023-22499 is a high-severity vulnerability in Deno, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2023-01-17.
How severe is CVE-2023-22499?: High severity. CVSS v3 base score is 7.5 out of 10.