CVE-2026-62909

Local privilege escalation via diagnostics IPC fallback

Published Aug 11, 2026 · Updated Aug 25, 2026

Privilege escalation in Microsoft .NET before 8.0.30, 9.0.19, and 10.0.11 allows local users to gain higher privileges via diagnostics IPC. In the diagnostics IPC socket transport, ipc_transport_get_default_name and the address-allocation path do not treat name-generation failure or snprintf truncation as fatal and can proceed with an empty sun_path value before bind. On Linux, that failure path can expose the channel through an abstract Unix domain socket without filesystem ACL protection; low-privileged local access is required, and Microsoft also lists affected Visual Studio 2022 17.14 and Visual Studio 2026 builds.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Microsoft .NET before 8.0.30, 9.0.19, and 10.0.11 allows local users to gain higher privileges via diagnostics IPC. In the diagnostics IPC socket transport, ipc_transport_get_default_name and the address-allocation path do not treat name-generation failure or snprintf truncation as fatal and can proceed with an empty sun_path value before bind. On Linux, that failure path can expose the channel through an abstract Unix domain socket without filesystem ACL protection; low-privileged local access is required, and Microsoft also lists affected Visual Studio 2022 17.14 and Visual Studio 2026 builds.

The record

CVE
CVE-2026-62909
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-252, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-252Unchecked Return Value
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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