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.NET 9.0 installed on Linux: vulnerabilities and security updates

Every CVE affecting .NET 9.0 installed on Linux and the Microsoft update (KB) that fixes it, ranked by real-world risk. Actively exploited (CISA KEV) first, then EPSS exploit probability, on top of CVSS severity.

CVEs
56
Updates (KBs)
12
Actively exploited (KEV)
0
Critical Severity
3

CVEs affecting .NET 9.0 installed on Linux

CVESeverityCVSSEPSSStatus
CVE-2025-21176High8.881%-
CVE-2025-55315Critical9.966%-
CVE-2025-55248Critical9.966%-
CVE-2025-55247High7.366%-
CVE-2026-50659Critical9.94.9%-
CVE-2026-47300High8.84.0%-
CVE-2026-47303High8.84.0%-
CVE-2026-69522High8.83.6%-
CVE-2026-47304High8.14.9%-
CVE-2026-50528High8.24.0%-
CVE-2026-50646High7.84.9%-
CVE-2026-50649High7.84.9%-
CVE-2026-50650High7.84.9%-
CVE-2026-58649High8.80.9%-
CVE-2026-69304High8.80.9%-
CVE-2026-69439High8.80.9%-
CVE-2026-71328High8.80.9%-
CVE-2026-47302High7.54.9%-
CVE-2026-50525High7.54.9%-
CVE-2026-50527High7.54.9%-
CVE-2026-50648High7.54.9%-
CVE-2026-62886High7.83.6%-
CVE-2026-50524High7.54.0%-
CVE-2026-50651High7.54.0%-
CVE-2026-56170High7.54.0%-
CVE-2026-57108High7.54.0%-
CVE-2026-45490High7.82.4%-
CVE-2026-45491High7.82.4%-
CVE-2025-26646High8.01.2%-
CVE-2026-26127High7.52.4%-
CVE-2026-26130High7.52.4%-
CVE-2026-26171High7.52.4%-
CVE-2026-32178High7.52.4%-
CVE-2026-32203High7.52.4%-
CVE-2026-33116High7.52.4%-
CVE-2026-32175High7.52.4%-
CVE-2026-42899High7.52.4%-
CVE-2026-45591High7.52.4%-
CVE-2026-62871High7.81.2%-
CVE-2026-62899High7.81.2%-
CVE-2026-62900High7.81.2%-
CVE-2026-62902High7.81.2%-
CVE-2026-62909High7.81.2%-
CVE-2026-70354High7.81.2%-
CVE-2025-21171High7.52.4%-
CVE-2025-21172High7.52.4%-
CVE-2026-50526High7.04.0%-
CVE-2026-32177High7.32.4%-
CVE-2026-35433High7.32.4%-
CVE-2025-21173High7.32.4%-
CVE-2026-62898High7.51.2%-
CVE-2026-62901High7.51.2%-
CVE-2025-30399High7.51.1%-
CVE-2026-21218High7.51.1%-
CVE-2026-62897High7.01.2%-
CVE-2026-69806High7.00.9%-

Updates (KBs) for .NET 9.0 installed on Linux

UpdateReleasedSeverityCVSSEPSSCVEsStatus
KB50683322025-10-14Critical9.966%3-
KB51040332026-07-14High8.84.0%17-
KB50505262025-01-14High8.82.4%4-
KB51261052026-09-08High8.80.9%6-
KB50971502026-06-09High7.82.4%3-
KB50592012025-05-13High8.01.2%1-
KB50812782026-03-10High7.52.4%2-
KB50860972026-04-14High7.52.4%4-
KB50934482026-05-12High7.52.4%4-
KB51221052026-08-11High7.81.2%10-
KB50619362025-06-10High7.51.1%1-
KB50778642026-02-10High7.51.1%1-

Ranked across all products on the Microsoft patch tracker and the CVE and vulnerability management reference. Browse every product: product index.

Most searched on Senserva right now

KB5122876 install notes and severity KB5126052: the full CVE list KB5122882: patch details KB5123099: the full CVE list KB5120708 download and what it fixes KB5122871 install notes and severity KB5129235 install notes and severity KB5122878: patch details KB5120238 download and what it fixes KB5129238 download and what it fixes
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.
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