CVE-2026-50526

Container image tampering via link-followed resources

Published Jul 14, 2026 · Updated Jul 14, 2026

Link-following in Microsoft.NET.Build.Containers in .NET SDK 8.0, 9.0, and 10.0 allows local users to inject container-image resources. Microsoft has not published the specific function; the container build process follows attacker-controlled links when collecting resources for another user's image. A low-privileged attacker must share the build host with another user, and successful exploitation can alter that user's image contents.

CVSS severity7.0
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link-following in Microsoft.NET.Build.Containers in .NET SDK 8.0, 9.0, and 10.0 allows local users to inject container-image resources. Microsoft has not published the specific function; the container build process follows attacker-controlled links when collecting resources for another user's image. A low-privileged attacker must share the build host with another user, and successful exploitation can alter that user's image contents.

The record

CVE
CVE-2026-50526
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
.NET 9.0
Classifications
CWE-345, CWE-59, T1195.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.0.0 <9.0.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · .NET 9.0version=9.0.0 <9.0.18
Microsoft · Microsoft .NETversion=8.0.0 <8.0.29
Microsoft · .NET 10.0version=10.0.0 <10.0.6
Microsoft · Microsoft Visual Studio 2022 version 17.12version=17.12.0 <17.12.22
Microsoft · Microsoft Visual Studio 2022 version 17.14version=17.14.0 <17.14.36
Microsoft · Microsoft Visual Studio 2026version=18.0 <18.7.4

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
7.0MicrosoftCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-59Improper Link Resolution Before File Access ('Link Following')
T1195.002Compromise Software Supply Chain

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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