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CVE-2026-69651: Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

53
This month
HIGH 7.5REMOTEWATCHLIST

CVE-2026-69651 is a high-severity flaw (CVSS 7.5) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.1% (top 34%)
CISA exploited listNo
WeaknessCWE-407
Published2026-10-13
Last modified2026-10-22
Publisher (CNA): Microsoft Corporation

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

Exact fixes by distribution

NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-arm · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-arm64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-musl-arm · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-musl-arm64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm64 --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-musl-x64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-x64 --version 9.0.21
NuGet (.NET) · Microsoft.NETCore.App.Runtime.linux-x64 · FIXED · 9.0.21 · vulnerable: >= 9.0.0, <= 9.0.20 · source
dotnet add package Microsoft.NETCore.App.Runtime.linux-x64 --version 9.0.21
Fedora 46 · python-streamlink · FIXED · 8.6.2-1.fc46 · FEDORA-2026-a56fcfdc08 · source
sudo dnf upgrade --advisory=FEDORA-2026-a56fcfdc08
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Ubuntu 22.04 · dotnet6 · DEFERRED
Ubuntu 22.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~22.04.1
sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~22.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~24.04.1
sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · dotnet10 · FIXED · 10.0.113-10.0.13-0ubuntu1~24.04.1
sudo apt update && sudo apt install --only-upgrade dotnet10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet10)" ge "10.0.113-10.0.13-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · dotnet8.0 · FIXED · dotnet8.0-8.0.132-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:86168 rpm -q dotnet8.0
RHEL 10 · dotnet9.0 · FIXED · dotnet9.0-9.0.122-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:86172 rpm -q dotnet9.0
RHEL 10 · dotnet10.0 · FIXED · dotnet10.0-10.0.113-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:86195 rpm -q dotnet10.0
RHEL 10.0 Extended Update Support · dotnet9.0 · FIXED · dotnet9.0-9.0.122-1.el10_0
sudo dnf upgrade --advisory=RHSA-2026:88424 rpm -q dotnet9.0
RHEL 10.0 Extended Update Support · dotnet8.0 · FIXED · dotnet8.0-8.0.132-1.el10_0
sudo dnf upgrade --advisory=RHSA-2026:88474 rpm -q dotnet8.0
Alpine 3.22 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0
apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime
Alpine 3.22 · dotnet9-runtime · FIXED · dotnet9-runtime-9.0.21-r0
apk add --upgrade dotnet9-runtime apk info -v dotnet9-runtime
Alpine 3.23 · dotnet10-runtime · FIXED · dotnet10-runtime-10.0.13-r0
apk add --upgrade dotnet10-runtime apk info -v dotnet10-runtime
Alpine 3.23 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0
apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-69651?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-69651 being exploited?

CVE-2026-69651 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-69651 affect?

CVE-2026-69651 affects affected software. Severity is high (CVSS 7.5). Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

How urgent is CVE-2026-69651?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

References

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