---
title: "CVE-2026-22863: Deno node:crypto doesn't finalize cipher"
url: https://erroneo.us/security/cve/CVE-2026-22863/
description: "CVE-2026-22863 (deno (crates.io (Rust))): Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.6.0, node:crypto doesn't finalize cipher. The…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-01-15
date_modified: 2026-01-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-22863"
kev: false
cvss: 9.2
epss: 0.00204
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.2% , percentile 10: FIRST’s model estimates a 0.2% chance of exploitation activity in the next 30 days, higher than 10% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes deno (crates.io (Rust)) <= 2.5.6, fixed in 2.6.0 . Check your lockfile, including transitive dependencies.

## What it is

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 packages

- crates.io (Rust) `deno` <= 2.5.6 → fixed: 2.6.0

## Affected products (CVE record)

- denoland deno: < 2.6.0

## Severity

- GitHub_M CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N`
- GitHub CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.20% probability of exploitation activity in the next 30 days; percentile 10.

## Sources

- [GitHub Advisory GHSA-5379-f5hf-w38v](https://github.com/advisories/GHSA-5379-f5hf-w38v)
- [CVE.org record CVE-2026-22863](https://www.cve.org/CVERecord?id=CVE-2026-22863)
- [NVD entry CVE-2026-22863](https://nvd.nist.gov/vuln/detail/CVE-2026-22863)
- [github.com](https://github.com/denoland/deno/security/advisories/GHSA-5379-f5hf-w38v)
- [github.com](https://github.com/denoland/deno/releases/tag/v2.6.0)

---
Source page: https://erroneo.us/security/cve/CVE-2026-22863/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt