CVE-2026-33116: Loop with unreachable exit condition ('infinite loop') in .NET, .NET Framework, Visual Studio allows an unauth

Q: How do I fix CVE-2026-33116?

.net: upgrade to 8.0.26, 9.0.15, 10.0.6; .net framework: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-33116 being exploited?

CVE-2026-33116 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33116 affect?

CVE-2026-33116 affects .net, .net framework. Severity is high (CVSS 7.5). Loop with unreachable exit condition ('infinite loop') in .NET, .NET Framework, Visual Studio allows an unauthorized attacker to deny service over a network.

Q: How urgent is CVE-2026-33116?

Priority 57/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEDOWNGRADE

CVE-2026-33116 is a high-severity flaw (CVSS 7.5) affecting .net, .net framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Loop with unreachable exit condition ('infinite loop') in .NET, .NET Framework, Visual Studio 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 score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-20, CWE-400, CWE-835, CWE-776
Published	2026-04-14
Last modified	2026-07-25

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-07-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 18:17 UTCPublished CVE record published
2026-07-25 11:10 UTCUpdated Record last modified

microsoft .net UPGRADE

Affected: >= 10.0.0 and < 10.0.6 · >= 8.0.0 and < 8.0.26 · >= 9.0.0 and < 9.0.15

Fixed in: 8.0.26, 9.0.15, 10.0.6

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy .net || rpm -q .net || .net --version

2. UPGRADE to 8.0.26 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade .net

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade .net

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison .net sudo apt install .net=<VERSION_BEFORE_8.0.0> sudo apt-mark hold .net

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net sudo dnf downgrade .net-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add .net

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

microsoft .net framework DOWNGRADE

Affected: 3.5 · 4.7.2 · 4.6.2 · 4.7 · 4.7.1 · 4.8 · 4.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5

1. Check installed version

apt-cache policy .net-framework || rpm -q .net-framework || .net-framework --version

2. No fixed release: DOWNGRADE to a release before 3.5 (Debian / Ubuntu)

apt-cache madison .net-framework sudo apt install .net-framework=<VERSION_BEFORE_3.5> sudo apt-mark hold .net-framework

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net-framework sudo dnf downgrade .net-framework-<VERSION_BEFORE_3.5> sudo dnf versionlock add .net-framework

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

NuGet (.NET) · System.Security.Cryptography.Xml · FIXED · 10.0.6 · vulnerable: >= 10.0.0, <= 10.0.5 · source

dotnet add package System.Security.Cryptography.Xml --version 10.0.6

Fedora 46 · icecat · FIXED · 153.6.0-2.rh1.fc46 · FEDORA-2026-25e05b5320 · source

sudo dnf upgrade --advisory=FEDORA-2026-25e05b5320

Fedora ELN · edk2 · FIXED · 20260812-14.eln159 · FEDORA-2026-8850ef9153 · source

sudo dnf upgrade --advisory=FEDORA-2026-8850ef9153

RHEL 10 · dotnet10.0 · FIXED · dotnet10.0-10.0.106-1.el10_1

sudo dnf upgrade --advisory=RHSA-2026:8467 rpm -q dotnet10.0

RHEL 10 · dotnet8.0 · FIXED · dotnet8.0-8.0.126-1.el10_1

sudo dnf upgrade --advisory=RHSA-2026:8470 rpm -q dotnet8.0

RHEL 10 · dotnet9.0 · FIXED · dotnet9.0-9.0.116-1.el10_1

sudo dnf upgrade --advisory=RHSA-2026:8472 rpm -q dotnet9.0

RHEL 10.0 Extended Update Support · dotnet9.0 · FIXED · dotnet9.0-9.0.116-1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:13280 rpm -q dotnet9.0

RHEL 10.0 Extended Update Support · dotnet8.0 · FIXED · dotnet8.0-8.0.126-1.el10_0

sudo dnf upgrade --advisory=RHSA-2026:13281 rpm -q dotnet8.0

Alpine 3.20 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.26-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Alpine 3.21 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.26-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Alpine 3.21 · dotnet9-runtime · FIXED · dotnet9-runtime-9.0.15-r0

apk add --upgrade dotnet9-runtime apk info -v dotnet9-runtime

Alpine 3.22 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.26-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1629 · source

sudo dnf update --advisory=ALAS2023-2026-1629

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-2026-33116?

.net: upgrade to 8.0.26, 9.0.15, 10.0.6; .net framework: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-33116 being exploited?

CVE-2026-33116 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-2026-33116 affect?

CVE-2026-33116 affects .net, .net framework. Severity is high (CVSS 7.5). Loop with unreachable exit condition ('infinite loop') in .NET, .NET Framework, Visual Studio allows an unauthorized attacker to deny service over a network.

How urgent is CVE-2026-33116?

Priority 57/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

.NET vulnerabilities · Visual Studio vulnerabilities

Related CVEs

CVE-2026-32178 HIGH 7.5 UPGRADE UPGRADE Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a
CVE-2026-26171 HIGH 7.5 UPGRADE UPGRADE Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.
CVE-2026-32203 HIGH 7.5 UPGRADE UPGRADE Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a n
CVE-2026-42899 HIGH 7.5 UPGRADE Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny
CVE-2026-35433 HIGH 7.3 DOWNGRADE UPGRADE Improper input validation in .NET allows an unauthorized attacker to elevate privileges locally.

References

← Back to latest CVEs