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Superseded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 2031

Mon 1 Dec

Tue 2 Dec

Wed 3 Dec

Thu 4 Dec

Fri 5 Dec

Sat 6 Dec

Sun 7 Dec

Mon 8 Dec

Tue 9 Dec

Patch Tuesday

Wed 10 Dec

Thu 11 Dec

Fri 12 Dec

Sat 13 Dec

Sun 14 Dec

Mon 15 Dec

Tue 16 Dec

Wed 17 Dec

Thu 18 Dec

Fri 19 Dec

Sat 20 Dec

Sun 21 Dec

Mon 22 Dec

Tue 23 Dec

Wed 24 Dec

Thu 25 Dec

Fri 26 Dec

Sat 27 Dec

Sun 28 Dec

Mon 29 Dec

Tue 30 Dec

Wed 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