CVE-2026-50646: microsoft microsoft .net framework 3.5 Deserialization of Untrusted Data
CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-50646GHSA-gh2h-rhph-h37gBIT-dotnet-2026-50646BIT-dotnet-sdk-2026-50646
Published 14-07-2026Last modified 08-10-2026
Vulnerability summary
CVE-2026-50646 is a high (CVSS 7.8) Deserialization of Untrusted Data vulnerability in microsoft microsoft .net framework 3.5. EPSS estimates a 4.02% chance of exploitation in the next 30 days, higher than 90.4% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
4.02%
0%100%
Low · +3.05 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 16Timeline
- 14-07-2026PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
Description
Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · NugetEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
4.02%
Chance of exploitation in the next 30 days
Percentile
90%
Versus all other CVEs
30-day change
+3.05 pp
From 0.97% on 19-09-2026
19-09-202619-10-2026
EPSS score4.02%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
- CWE-693Protection Mechanism FailureThe product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
Affected systems
Microsoft15 products
- microsoft .net framework 3.5≥ 3.5.0, < 2.0.50727.8983 & 3.0.30729.8978
- microsoft .net framework 3.5 and 4.7.2≥ 4.7.0, < 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0
- microsoft .net framework 3.5 and 4.8≥ 4.8.0, < 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
- microsoft .net framework 3.5 and 4.8.1≥ 4.8.1, < 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
- microsoft .net framework 4.6.2/4.7/4.7.1/4.7.2≥ 4.7.0, < 4.7.4143.0
NuGet3 products
- Microsoft.WindowsDesktop.App.Runtime.win-arm64≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
- Microsoft.WindowsDesktop.App.Runtime.win-x64≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
- Microsoft.WindowsDesktop.App.Runtime.win-x86≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
Ubuntu1 product
- dotnet7All versions (No fix recorded)
3 vendors · 19 products
References
9 links
- github.com/dotnet/wpfPACKAGE