Patch tracker / KB5081278

KB5081278: Microsoft.Bcl.Memory 10.0 Security Update (March 2026)

KB5081278 is a High security update for Microsoft.Bcl.Memory 10.0, released 2026-03-10. It closes 2 CVEs with a maximum CVSS of 7.5. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.

High

Update summary

Released
2026-03-10
CVEs fixed
2
Max CVSS
7.5
Severity
High
Deploy this cycle
Fixes 2 CVEs for Microsoft.Bcl.Memory 10.0. No confirmed in-the-wild exploitation in this set today.
Microsoft Update Catalog: download KB5081278Microsoft support article

New to these terms? How the Microsoft patching tools fit together, this month's Patch Tuesday summary, and every update ranked by real-world risk.

Senserva AI Opinion for KB5081278

KB5081278 patches two vulnerabilities (CVE-2026-26127 and CVE-2026-26130) in Microsoft.Bcl.Memory 10.0 and the .NET 10.0 runtime on both Windows and Mac OS. The cross-platform reach matters here: any developer machine or server running .NET 10.0 apps, regardless of OS, is in scope. Highest Severity is High at CVSS 7.5, but exploitation likelihood is low with EPSS at 3 percent and no CISA KEV or ransomware association.

Do this: Inventory your Windows and Mac hosts running .NET 10.0 and update the runtime and the Microsoft.Bcl.Memory 10.0 package to the patched build.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5081278

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5081278

Released
2026-03-10
Last changed
2026-03-10
Changes tracked
1

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Exploitation and severity

Fixes 2 CVEs. Most severe CVSS 7.5 (High). EPSS exploit probability up to 2.8%.

Among the lower half of tracked Microsoft updates by EPSS exploit probability.

What to do

Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5081278 is missing on your devices.

Check if KB5081278 is installed

Copy-paste PowerShell: one machine, or your whole estate in one pass. No output means the update is not installed.

Get-HotFix covers Windows updates. Office, SharePoint, and Exchange server updates show under installed updates in Programs and Features, or check the Update Catalog history.

CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2026-26127High7.82.8%No
CVE-2026-26130High7.82.8%No

Affected products

Also released in March 2026

The highest-risk updates from the same release:

KB5002843KB5002845KB5002850KB5077464KB5077465KB5077466KB5077468KB5077469

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references

Official KB5081278 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Data notice: this page, the feeds, and the API are provided as is, for informational purposes only, without warranty of any kind. Senserva, LLC does not guarantee the accuracy, completeness, or timeliness of third-party data (MSRC, NVD, CISA KEV, EPSS) and accepts no liability for actions taken based on it; verify against the authoritative vendor advisory before acting. Built daily with Senserva Trustworthy AI. All use of this data is subject to the Senserva EULA.