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Vulnerabilities

Vulnerability · CVE-2026-83782

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

Published Oct 13, 2026 · catalog updated Oct 21, 2026 · Microsoft

Check if you run it

No confirmed exploitation is on record for CVE-2026-83782. EPSS is 0.89%. Act only if a listed version of Microsoft is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.89%
Remediation
Advisory link
Affected products
vendor Microsoft

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoftversion unspecified

How to fix CVE-2026-83782

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-83782. EPSS is 0.89%. Act only if a listed version of Microsoft is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.89%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · EUVD

    Detected

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

  2. Oct 21, 2026 · EUVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-83782

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-83782

    30-day exploitation probability 0.89%

    first.org
  • EUVDVulnerability recordEUVD-2026-99365

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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

CVE-2026-83782: Microsoft — Heap-based buffer overflow in Windows S… · ZeroDay Findings