Tuesday 13 October 2026

October 2026: is it safe to deploy?

What Microsoft fixed, how urgent it is, and whether anything broke, per Windows version, from Microsoft's release tables, release health, MSRC, CISA, and what the community reports.

← Sep 2026 Nov 2026 →

Superseded

Newer updates replace October 2026.

Microsoft fixed 1474 CVEs, 94 critical and 1 exploited; 1 known issue is still open; out-of-band fixes followed on 26 Oct. See November 2026 Patch Tuesday.

59 of these CVEs were added after 13 Oct 2026; the release-day timeline keeps the original publication dates.

ChangeIntel's reading of public signals, not advice; check Microsoft's guidance and test before you deploy. Terms

Microsoft CVEs: 1474
Critical: 94
Exploited fixed: 1
In CISA KEV: 1
Open known issues: 1
Out-of-band: 8

Release calendar · December 2026

Tue 1 Dec

Wed 2 Dec

Thu 3 Dec

Fri 4 Dec

Sat 5 Dec

Sun 6 Dec

Mon 7 Dec

Tue 8 Dec

Patch Tuesday

Wed 9 Dec

Thu 10 Dec

Fri 11 Dec

Sat 12 Dec

Sun 13 Dec

Mon 14 Dec

Tue 15 Dec

Wed 16 Dec

Thu 17 Dec

Fri 18 Dec

Sat 19 Dec

Sun 20 Dec

Mon 21 Dec

Tue 22 Dec

Wed 23 Dec

Thu 24 Dec

Fri 25 Dec

Sat 26 Dec

Sun 27 Dec

Mon 28 Dec

Tue 29 Dec

Wed 30 Dec

Thu 31 Dec

Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions