CVE-2026-35433: microsoft microsoft .net framework 3.5 Improper Input Validation
CVSS: 7.3v3.1HighModified
AliasesUBUNTU-CVE-2026-35433GHSA-8x9c-mqxv-q2ppBIT-dotnet-2026-35433BIT-dotnet-sdk-2026-35433
Published 12-05-2026Last modified 10-08-2026
Vulnerability summary
CVE-2026-35433 is a high (CVSS 7.3) Improper Input Validation vulnerability in microsoft microsoft .net framework 3.5. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.1% of scored vulnerabilities.
CVSS score
7.3/10
010
High · v3.1 (CVE.org)EPSS score
0.57%
0%100%
Low · -0.09 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 12-05-2026PublishedVulnerability first disclosed.
- 10-08-2026Last modifiedVulnerability information updated.
Description
Improper input validation in .NET allows an unauthorized attacker to elevate privileges locally.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:CSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.3HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
- OSV · NugetEcosystem advisory · calculated7.3HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
- NVDNIST7.3HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
-0.09 pp
From 0.66% on 20-09-2026
20-09-202620-10-2026
EPSS score0.57%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Affected systems
Microsoft10 products
- microsoft .net framework 3.5≥ 3.5.0, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 3.5 and 4.7.2≥ 4.7.0, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 3.5 and 4.8≥ 4.8.0, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 3.5 and 4.8.1≥ 4.8.1, < 4.8.9334.0 and 4.8.4802.0
- microsoft .net framework 4.8≥ 4.8.0, < 4.8.9334.0 and 4.8.4802.0
NuGet3 products
- Microsoft.WindowsDesktop.App.Runtime.win-arm64≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
- Microsoft.WindowsDesktop.App.Runtime.win-x64≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
- Microsoft.WindowsDesktop.App.Runtime.win-x86≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
Ubuntu1 product
- dotnet7All versions (No fix recorded)
3 vendors · 14 products
References
11 links
Show all 11 references
- github.com/dotnet/wpfPACKAGE