October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)
Microsoft today released patches for 1,417 vulnerabilities. 76 of these vulnerabilities are rated critical, with 7 critical vulnerabiilties requiring no customer actions. One vulnerability was disclosed before today's patch Tuesday, and one is already exploited.
Excerpt from the primary source: SANS Internet Storm Center
Who is affected
Security professionals
What you should do · Patch
Apply the vendor's security update for the affected products. Check the linked advisory for affected and fixed versions, and put internet-facing systems first.
Automated guidance based on this story's classification. Check the linked advisories for specifics.
Sources
We link to original and authoritative sources. Headlines and excerpts belong to their publishers.
Security research
Related
Microsoft October 2026 Patch Tuesday fixes 1,411 flaws, 3 zero-days
Today is Microsoft's October 2026 Patch Tuesday, with security updates addressing a record-breaking 1,411 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.
Source reporting says attackers are already exploiting this, so exposed affected systems are at immediate risk.
Treat this as an emergency.
Microsoft releases Windows 10 KB5126657 extended security update
Microsoft released the Windows 10 KB5126657 extended security update, which includes this month's record-breaking October 2026 Patch Tuesday fixes and a few bug fixes and changes.
VU#456950: Komodo Periphery Agent Contains an OS Command Injection Vulnerability
Overview Versions <= 2.2.0 of Periphery, an agent within the Komodo server management platform, is vulnerable to OS command injection due to missing validation of container names, through two vectors: container destruction and container log searches. This allows an authenticated attacker to execute arbitrary commands as root on the underlying host, enabling persistent compromise of…
VU#573195: Go, OpenSSL, Apple, LibreSSL, pyca, wolfSSL Name-Constraint Inconsistency in RFC 5280 Implementation
Overview This note covers differences in how TLS libraries interpret X.509 Name Constraints. A certificate that one library accepts may be rejected by another. Some of those differences are defects; others follow from behavior that RFC 5280 does not fully specify. Description The observed differences concern DNS name comparison, IP address handling, URI-authority parsing, and wildcard matching. These include both…
Apply the vendor's security update for the affected products.
