6.5

CVE-2026-50659: .NET Spoofing Vulnerability

Analyzed
AliasesUBUNTU-CVE-2026-50659CGA-3m97-4qmq-q7wjCGA-3vw3-pv9q-j9mr
Published 14-07-2026Last modified 01-11-2026

Vulnerability summary

CVE-2026-50659 is a medium (CVSS 6.5) Improper Encoding or Escaping of Output vulnerability in microsoft microsoft .net framework 3.5. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 54.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.74%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 2
RHSA-2026:26638RHSA-2026:39952RHSA-2026:41893RHSA-2026:41894RHSA-2026:41895RHSA-2026:41896

Timeline

  1. 14-07-2026
    PublishedVulnerability first disclosed.
  2. 01-11-2026
    Last modifiedVulnerability information updated.

Description

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.74%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.74% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Microsoft17 products
NuGet12 products
  • Microsoft.NETCore.App.Runtime.linux-arm≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
  • Microsoft.NETCore.App.Runtime.linux-arm64≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
  • Microsoft.NETCore.App.Runtime.linux-musl-arm≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
  • Microsoft.NETCore.App.Runtime.linux-musl-arm64≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
  • Microsoft.NETCore.App.Runtime.linux-musl-x64≥ 10.0.0, < 10.0.10 | ≥ 9.0.0, < 9.0.18 | ≥ 8.0.0, < 8.0.29
Ubuntu4 products
  • dotnet10< 10.0.110-10.0.10-0ubuntu1~24.04.1 | < 10.0.110-10.0.10-0ubuntu1~26.04.1
  • dotnet6All versions (No fix recorded)
  • dotnet7All versions (No fix recorded)
  • dotnet8< 8.0.129-8.0.29-0ubuntu1~22.04.1 | < 8.0.129-8.0.29-0ubuntu1~24.04.1
Alpine3 products
  • dotnet10-runtime< 10.0.10-r0
  • dotnet8-runtime< 8.0.29-r0
  • dotnet9-runtime< 9.0.18-r0
Chainguard2 products
  • dotnet-bootstrap-8< 8.0.130-r0
  • dotnet-bootstrap-9< 9.0.120-r0
Wolfi2 products
  • dotnet-bootstrap-8< 8.0.130-r0
  • dotnet-bootstrap-9< 9.0.120-r0

6 vendors · 40 products

References

11 links
Show all 11 references