ReviewHigh
CVE-2026-70354
Microsoft .NET 10.0, .NET 8.0, .NET 9.0
Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.
- CVSS
- 7.8
- EPSS
- - - percentile
- CISA KEV
- Not listed
- Published
- 2026.08.12
Review
The CVSS severity warrants an early asset and exposure review.
Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8
Vulnerability overview
Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.
Affected product and versions
- Product
- Microsoft .NET 10.0, .NET 8.0, .NET 9.0
- Affected versions
- >= 10.0.0 < 10.0.11, >= 8.0.0 < 8.0.30, >= 9.0.0 < 9.0.19, >= 3.5.0 < 2.0.50727.8984 & 3.0.30729.8980, >= 3.0.0.0 < 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0, >= 4.7.0 < 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0, >= 4.8.0 < 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0, >= 4.8.1 < 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0, >= 4.7.0 < 4.7.4144.0, >= 4.8.0 < 4.8.4805.0, >= 4.8.0.0 < 4.8.9344.0, >= 17.14.0 < 17.14.38, >= 18.0 < 18.8.3, >= 18.8.0 < 18.8.3, 4.8.1, 4.8, 4.6.2, 4.7, 4.7.1, 4.7.2
- Fixed versions
- 17.14.38, 18.8.3, 8.0.30, 9.0.19, 10.0.11
Recommended response sequence
Confirm exposure before applying a vendor-supported change.
- 1Identify
Confirm that Microsoft .NET 10.0, .NET 8.0, .NET 9.0 and an affected version are present.
- 2Prioritize
Combine exploitation signals with asset exposure and business criticality.
- 3Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
- 4Verify
Recheck the version, service health, access paths, and relevant logs.
Technical data
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-787