{"id":"CVE-2026-69304","title":"Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.","summary":"Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-409"],"vendor":"Microsoft","product":".NET 10.0","affected":[".net_10.0 >= 10.0.0 < 10.0.12",".net_8.0 >= 8.0.0 < 8.0.31",".net_9.0 >= 9.0.0 < 9.0.20","asp.net_core_10.0 >= 10.0 < 10.0.12","asp.net_core_11.0 >= 11.0 < 11.0 RC1","asp.net_core_8.0 >= 8.0 < 8.0.31","asp.net_core_9.0 >= 9.0 < 9.0.20","visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.40","visual_studio_2026_version_18.9 >= 18.9.0 < 18.9.3"],"published":"2026-09-08","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:17:46.873","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-69304","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304","label":"secure@microsoft.com"},{"url":"https://github.com/dotnet/aspnetcore/security/advisories/GHSA-8cp2-47hg-mfgh"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69304"},{"url":"https://github.com/advisories/GHSA-8cp2-47hg-mfgh"}],"tags":["nvd","cve.org","ghsa","nuget"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T19:33:58.502592Z"},"ingestedAt":"2026-09-08T19:08:49.608Z","aliases":["GHSA-8cp2-47hg-mfgh"],"ecosystem":"nuget","patched":["Microsoft.AspNetCore.Server.IISIntegration 11.0.0-rc.1","Microsoft.AspNetCore.Server.IISIntegration 8.0.31","Microsoft.AspNetCore.Server.IISIntegration 9.0.20","Microsoft.AspNetCore.Server.IISIntegration 10.0.12"],"epss":0.00768,"epssPercentile":0.54074,"slug":"CVE-2026-69304","body":"## Overview\n\nImproper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-69304)\n\nAffected packages:\n\n- `Microsoft.AspNetCore.Server.IISIntegration >= 11.0.0-preview.1, < 11.0.0-rc.1`\n- `Microsoft.AspNetCore.Server.IISIntegration >= 8.0.0, <= 8.0.30`\n- `Microsoft.AspNetCore.Server.IISIntegration >= 9.0.0, <= 9.0.19`\n- `Microsoft.AspNetCore.Server.IISIntegration >= 10.0.0, <= 10.0.11`\n\nPatched in:\n\n- `Microsoft.AspNetCore.Server.IISIntegration 11.0.0-rc.1`\n- `Microsoft.AspNetCore.Server.IISIntegration 8.0.31`\n- `Microsoft.AspNetCore.Server.IISIntegration 9.0.20`\n- `Microsoft.AspNetCore.Server.IISIntegration 10.0.12`\n\nSource: https://github.com/advisories/GHSA-8cp2-47hg-mfgh","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}