---
title: "Security digest: January 21, 2026"
url: https://erroneo.us/security/2026-01-21/
description: "January 21, 2026 vulnerability digest: 1 CISA KEV addition (Cisco); 2 critical advisories (npm, Composer (PHP)). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2026-01-21
date_modified: 2026-01-21
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: January 21, 2026

1 known exploited (cisa kev) addition and 2 critical advisories.

## Take stock

- Do you run any of these? Cisco Unified Communications Manager. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-02-11.
- npm: 1 critical advisory ( sm-crypto ). Check with npm audit (or: npm ls <package>) .
- Composer (PHP): 1 critical advisory ( laravel/reverb ). Check with composer audit .
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Known exploited (CISA KEV)

- [CVE-2026-20045](https://erroneo.us/security/cve/CVE-2026-20045/index.md) Cisco Unified Communications Manager: Cisco Unified Communications Products Code Injection Vulnerability (CISA due 2026-02-11)

## Critical advisories

- [CVE-2026-23966](https://erroneo.us/security/cve/CVE-2026-23966/index.md) sm-crypto Affected by Private Key Recovery in SM2-PKE — npm sm-crypto < 0.3.14 → 0.3.14
- [CVE-2026-23524](https://erroneo.us/security/cve/CVE-2026-23524/index.md) Laravel Redis Horizontal Scaling Insecure Deserialization — Composer (PHP) laravel/reverb < 1.7.0 → 1.7.0

---
Source page: https://erroneo.us/security/2026-01-21/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt