Microsoft .NET Framework 3.5 AND…: Access of Resource Using Incompatible Type
CVE-2026-102869 is a high-severity access of resource using incompatible type vulnerability in Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 from Microsoft, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists version 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 as the first without the flaw, so updating Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.84% chance of exploitation within 30 days, higher than 58% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 to 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 or a later version.
- Update Microsoft .NET Framework 3.5 AND 4.7.2 to 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 or a later version.
- Update Microsoft .NET Framework 3.5 AND 4.8 to 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 or a later version.
- Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 | 3.0.0.0 up to, but not including, 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 | 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 | 4.7.0 up to, but not including, 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 | 4.8.0 up to, but not including, 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 | 4.8.1 up to, but not including, 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 | 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | 4.7.0 up to, but not including, 4.7.4150.0 | 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 4.8 | 4.8.0 up to, but not including, 4.8.4811.0 | 4.8.4811.0 |
| Microsoft | Microsoft .NET Framework 4.8.1 | 4.8.0.0 up to, but not including, 4.8.9363.0 | 4.8.9363.0 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 up to, but not including, 17.14.42 | 17.14.42 |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 up to, but not including, 18.10.4 | 18.10.4 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by CNA (microsoft.com).
Official description
Access of resource using incompatible type ('type confusion') in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Access of Resource Using Incompatible Type
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
More Access of Resource Using Incompatible Type vulnerabilities (CWE-843)
Timeline
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Recent Access of Resource Using Incompatible Type vulnerabilities
- 8.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.0 High severity
- 7.8 High severity
- 8.1 High severity
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