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.

EPSS: 0.002 (9.5th percentile) — read the EPSS interpretation.

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.

Affected products

Deno
Denoland Deno — versions < 2.6.0

Weakness classification (CWE)

CWE-325 — Missing Cryptographic Step

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, 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.