{"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":"asp.net_core","affected":["asp.net_core >= 8.0.0, < 8.0.28","asp.net_core >= 9.0.0, < 9.0.17","asp.net_core >= 10.0.0, < 10.0.9","asp.net_core > 11.0.0","asp.net_core = 11.0","visual_studio_2022 >= 17.14.0, < 17.14.40","visual_studio_2026 >= 18.9.0, < 18.9.3",".net >= 8.0.0, < 8.0.31",".net >= 9.0.0, < 9.0.20",".net >= 10.0.0, < 10.0.12"],"patched":["asp.net_core 10.0.9","visual_studio_2022 17.14.40","visual_studio_2026 18.9.3",".net 10.0.12"],"published":"2026-09-08","updated":"2026-09-30","sourceUpdated":"2026-09-30T20:49:06.713","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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-69304.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-69304"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2529952"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-69304"},{"url":"https://access.redhat.com/errata/RHSA-2026:74950"},{"url":"https://access.redhat.com/errata/RHSA-2026:74947"},{"url":"https://access.redhat.com/errata/RHSA-2026:66863"}],"tags":["nvd","cve.org","ghsa","nuget","csaf","vex","red-hat"],"epss":0.00855,"epssPercentile":0.58152,"aliases":["GHSA-8cp2-47hg-mfgh"],"ecosystem":"nuget","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T19:33:58.502592Z"},"ingestedAt":"2026-09-08T19:08:49.608Z","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## Affected\n\n- `asp.net_core >= 8.0.0, < 8.0.28`\n- `asp.net_core >= 9.0.0, < 9.0.17`\n- `asp.net_core >= 10.0.0, < 10.0.9`\n- `asp.net_core > 11.0.0`\n- `asp.net_core = 11.0`\n- `visual_studio_2022 >= 17.14.0, < 17.14.40`\n- `visual_studio_2026 >= 18.9.0, < 18.9.3`\n- `.net >= 8.0.0, < 8.0.31`\n- `.net >= 9.0.0, < 9.0.20`\n- `.net >= 10.0.0, < 10.0.12`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `asp.net_core 10.0.9`\n- `visual_studio_2022 17.14.40`\n- `visual_studio_2026 18.9.3`\n- `.net 10.0.12`\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\n\n## Vendor advisories\n\n- **RHSA-2026:74950** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74950)\n- **RHSA-2026:74947** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74947)\n- **RHSA-2026:66863** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:66863)","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}