CVE-2026-22863 Deno node:crypto doesn't finalize cipher
Attackers can exploit incomplete cipher finalization in Deno's node:crypto to potentially learn server secrets through refined attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-22863?
CVE-2026-22863 is a critical vulnerability in denoland deno, published on 15 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-325
Which versions are affected by CVE-2026-22863?
2 open source packages ship an affected version, including deno. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
deno crates.io | All versions | 2.6.0 |
deno crates.io | All versions | 2.6.0 |
Products include Deno Deno.
How do I fix CVE-2026-22863?
Upgrade deno to 2.6.0 or later.
Is CVE-2026-22863 being exploited?
There is no known exploitation of CVE-2026-22863 in the wild and no public exploit code.
Other vulnerabilities in denoland deno
- CVE-2023-28445 Deno improperly handles resizable ArrayBuffer
- CVE-2022-24783 Sandbox bypass leading to arbitrary code execution in Deno
- CVE-2021-32619 Static imports inside dynamically imported modules do not adhere to permission checks
- CVE-2024-27936 Deno interactive permission prompt spoofing via improper ANSI stripping
- CVE-2023-28446 Deno is vulnerable to interactive `run` permission prompt spoofing via improper ANSI neutralization
Sources
Also known as GHSA-5379-f5hf-w38v, JLSEC-2026-114.