CVE-2026-22863: Deno node:crypto doesn't finalize cipher

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-01-15 · updated 2026-06-17
Weakness: CWE-325

Description

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.

Affected products

denoland deno: before 2.6.0 — fixed in 2.6.0

How to fix

Upgrade to a fixed version: denoland deno 2.6.0. Check the vendor advisory for mitigations.

References

https://github.com/denoland/deno/releases/tag/v2.6.0
https://github.com/denoland/deno/security/advisories/GHSA-5379-f5hf-w38v

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