What is CVE-2026-22863?

CVE-2026-22863 is a high-severity vulnerability in Deno, classified under Missing Cryptographic Step. CVSS score: 7.5/10. Published 2026-01-15.

How severe is CVE-2026-22863?

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

Vulnerability in Deno

CVE-2026-22863

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.6.0, node:crypto doesn't finalize cipher. The vulnerability allows an attacker to have infinite encryptions. This can lead to naive attempts at brute forcing, as well as more refined attacks with the goal to learn the server secrets. This vulnerability is fixed in 2.6.0.

Published 2026-01-15 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.002 (9.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Deno
Denoland Deno — versions < 2.6.0

Weakness classification (CWE)

CWE-325 — Missing Cryptographic Step

References

github.com/denoland/deno/security/advisories/GHSA-5379-f5hf-w38v (Exploit, Vendor Advisory)
github.com/denoland/deno/releases/tag/v2.6.0 (Release Notes)

Frequently asked questions

What is CVE-2026-22863?: CVE-2026-22863 is a high-severity vulnerability in Deno, classified under Missing Cryptographic Step. CVSS score: 7.5/10. Published 2026-01-15.
How severe is CVE-2026-22863?: High severity. CVSS v3 base score is 7.5 out of 10.