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Vulnerabilities

Vulnerability · CVE-2026-69304

Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Published Sep 8, 2026 · catalog updated Oct 30, 2026 · asp.net core

Last checked Nov 8, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-69304. EPSS is 0.85%. Act only if a listed version of asp.net core is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.85%
Remediation
Version ranges on file
Affected products
cpe microsoft/asp.net core · cpe microsoft/visual studio 2022 · cpe microsoft/visual studio 2026

Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/asp.net core11.0
  • cpe microsoft/asp.net core< 10.0.9
  • cpe microsoft/asp.net core< 8.0.28
  • cpe microsoft/asp.net core< 9.0.17
  • cpe microsoft/visual studio 2022< 17.14.40
  • cpe microsoft/visual studio 2026< 18.9.3

How to fix CVE-2026-69304

  • Upgrade

    CVE-2026-69304 lists a fix boundary at 10.0.9. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 10.0.9

  • Advisory

    Open the inventory_high record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-69304. EPSS is 0.85%. Act only if a listed version of asp.net core is installed.

Which versions are affected?

Compare what you have installed with microsoft/asp.net core 11.0; microsoft/asp.net core < 10.0.9; microsoft/asp.net core < 8.0.28; microsoft/asp.net core < 9.0.17. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-409. EPSS 0.85%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

ASP.NET Core security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 8, 2026 · Monitored products — high

    Detected

    Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

  2. Oct 30, 2026 · Monitored products — high

    Updated

    Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Sources

  • Monitored products — highVendor advisoryCVE-2026-69304

    Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 8, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — highNov 8, 2026