8.8

CVE-2026-83520: microsoft microsoft .net framework 3.5 Deserialization of Untrusted Data

CVSS: 8.8v3.1HighAwaiting analysis
AliasesGHSA-4w5f-7jp2-w48g
Published 13-10-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-83520 is a high (CVSS 8.8) Deserialization of Untrusted Data vulnerability in microsoft microsoft .net framework 3.5. EPSS estimates a 1.27% chance of exploitation in the next 30 days, higher than 69.3% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
1.27%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-10-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

1.27%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

14-10-202619-10-2026
EPSS score
1.27%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft14 products
NuGet3 products
  • Microsoft.WindowsDesktop.App.Runtime.win-arm64≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 10.0.0, < 10.0.13 | ≥ 8.0.0, < 8.0.32 | ≥ 9.0.0, < 9.0.21
  • Microsoft.WindowsDesktop.App.Runtime.win-x64≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 10.0.0, < 10.0.13 | ≥ 8.0.0, < 8.0.32 | ≥ 9.0.0, < 9.0.21
  • Microsoft.WindowsDesktop.App.Runtime.win-x86≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 10.0.0, < 10.0.13 | ≥ 8.0.0, < 8.0.32 | ≥ 9.0.0, < 9.0.21

2 vendors · 17 products

References

6 links