Patch Tuesday: January 2026

Next Patch Tuesday: Tue 13 Oct 2026 (in 3 days)

January 2026 Patch Tuesday: Microsoft fixed 112 vulnerabilities, 8 of them Critical. 1 was already being exploited. Released Tue 13 Jan 2026.

• 112vulnerabilities fixed
• 8Critical
• 1exploited before the fix
• 1publicly disclosed
• 2now on CISA KEV

By type: 55 elevation of privilege, 22 remote code execution, 22 information disclosure, 5 spoofing, 3 security feature bypass, 3 tampering, 2 denial of service.

Update problems? Ask in Patch Tuesday & Updates. From October 2026 a “what broke for you?” thread opens there at 1 pm Eastern every Patch Tuesday.

Patch these first

Being exploited, already public, or on CISA’s list of vulnerabilities attackers are using. Whatever else waits for testing, these should not.

Critical (8)

Microsoft’s top rating: usually code execution with little or no user action.

Added to CISA KEV in January 2026 (17)

Every vendor, not only Microsoft. CISA adds a vulnerability when it has evidence attackers are using it. US federal agencies must fix it by the deadline shown; for everyone else, it is the best free “patch this now” list there is.

All 112 fixes

Published later in the month (12)

Microsoft Edge updates, out-of-band fixes and cloud services. “Fixed by Microsoft” means a cloud service Microsoft has already patched: there is nothing to install.

From Microsoft’s Security Update Guide and CISA’s Known Exploited Vulnerabilities catalog, checked 6 hours ago. Only vulnerabilities Microsoft itself issued are counted; Chromium fixes that Edge inherits are left out. For known problems with the updates themselves, see Windows release health.