PatchTheCVECVE-2026-62897: Integer overflow or wraparound in .NET Framework allows an unauthorized attacker to execute code locally.
37
Routine
HIGH 7.0WATCHLISTDOWNGRADEUPGRADEUPGRADE
CVE-2026-62897 is a high-severity flaw (CVSS 7.0) affecting .net framework, visual studio 2022, visual studio 2026. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Integer overflow or wraparound in .NET Framework allows an unauthorized attacker to execute code locally.
Why this priority
- High severity
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.0 (High) |
| Attack vector | Local |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.4% (top 69%) |
| CISA exploited list | No |
| Weakness | CWE-190 |
| Published | 2026-08-11 |
| Last modified | 2026-08-14 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Last updated 2026-08-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
microsoft .net framework DOWNGRADE
Affected: 3.5 · 4.7.2 · 4.8.1 · 4.8
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.
microsoft visual studio 2022 UPGRADE
Affected: >= 17.14.0 and < 17.14.38
Fixed in: 17.14.38
Safe to downgrade to: a release before 17.14.0
1. Check installed version
apt-cache policy visual-studio-2022 || rpm -q visual-studio-2022 || visual-studio-2022 --version
2. UPGRADE to 17.14.38 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade visual-studio-2022
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade visual-studio-2022
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 17.14.0 (Debian / Ubuntu)
apt-cache madison visual-studio-2022
sudo apt install visual-studio-2022=<VERSION_BEFORE_17.14.0>
sudo apt-mark hold visual-studio-2022
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list visual-studio-2022
sudo dnf downgrade visual-studio-2022-<VERSION_BEFORE_17.14.0>
sudo dnf versionlock add visual-studio-2022
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 visual studio 2026 UPGRADE
Affected: >= 18.8.0 and < 18.8.3
Fixed in: 18.8.3
Safe to downgrade to: a release before 18.8.0
1. Check installed version
apt-cache policy visual-studio-2026 || rpm -q visual-studio-2026 || visual-studio-2026 --version
2. UPGRADE to 18.8.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade visual-studio-2026
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade visual-studio-2026
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 18.8.0 (Debian / Ubuntu)
apt-cache madison visual-studio-2026
sudo apt install visual-studio-2026=<VERSION_BEFORE_18.8.0>
sudo apt-mark hold visual-studio-2026
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list visual-studio-2026
sudo dnf downgrade visual-studio-2026-<VERSION_BEFORE_18.8.0>
sudo dnf versionlock add visual-studio-2026
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 UPGRADE
Affected: >= 8.0.0 and < 8.0.30 · >= 9.0.0 and < 9.0.19 · >= 10.0.0 and < 10.0.11
Fixed in: 8.0.30, 9.0.19, 10.0.11
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 8.0.30 (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.
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.
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-2026-62897?
.net framework: downgrade or apply the listed mitigation; visual studio 2022: upgrade to 17.14.38; visual studio 2026: upgrade to 18.8.3. Exact commands for each OS are on this page.
Is CVE-2026-62897 being exploited?
CVE-2026-62897 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-2026-62897 affect?
CVE-2026-62897 affects .net framework, visual studio 2022, visual studio 2026. Severity is high (CVSS 7.0). Integer overflow or wraparound in .NET Framework allows an unauthorized attacker to execute code locally.
How urgent is CVE-2026-62897?
Priority 37/100. High severity; On your watchlist
Software pages
.NET vulnerabilities · Visual Studio vulnerabilities
Related CVEs
- CVE-2026-23666 HIGH 7.5 DOWNGRADE Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
- CVE-2026-35433 HIGH 7.3 DOWNGRADE UPGRADE Improper input validation in .NET allows an unauthorized attacker to elevate privileges locally.
- CVE-2026-96960 HIGH 7.5 UPGRADE DOWNGRADE Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a
- CVE-2026-96959 HIGH 7.5 UPGRADE DOWNGRADE Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny service o
- CVE-2026-96958 HIGH 7.5 UPGRADE DOWNGRADE Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.