CVE-2026-77906: Heap-based buffer overflow in Visual Studio allows an unauthorized attacker to execute code over a network.

This month

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-77906 is a high-severity flaw (CVSS 8.8) affecting visual studio 2026. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in Visual Studio allows an unauthorized attacker to execute code over a network.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-09-08
Last modified	2026-09-11

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-09-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 18:20 UTCPublished CVE record published
2026-09-11 20:06 UTCUpdated Record last modified

microsoft visual studio 2026 UPGRADE

Affected: >= 18.9.0 and < 18.9.3

Fixed in: 18.9.3

Safe to downgrade to: a release before 18.9.0

1. Check installed version

apt-cache policy visual-studio-2026 || rpm -q visual-studio-2026 || visual-studio-2026 --version

2. UPGRADE to 18.9.3 (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 18.9.0 (Debian / Ubuntu)

apt-cache madison visual-studio-2026 sudo apt install visual-studio-2026=<VERSION_BEFORE_18.9.0> 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_18.9.0> 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.

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-2026-77906?

visual studio 2026: upgrade to 18.9.3. Exact commands for each OS are on this page.

Is CVE-2026-77906 being exploited?

CVE-2026-77906 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-2026-77906 affect?

CVE-2026-77906 affects visual studio 2026. Severity is high (CVSS 8.8). Heap-based buffer overflow in Visual Studio allows an unauthorized attacker to execute code over a network.

How urgent is CVE-2026-77906?

Priority 50/100. High severity; On your watchlist

Software pages

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References

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