{"id":"CVE-2026-69304","state":"PUBLISHED","title":"ASP.NET Core Denial of Service Vulnerability","description":"Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.","publishedAt":"2026-09-08T17:17:47.686Z","updatedAt":"2026-10-30T21:56:07.330Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","source":"microsoft"},"assigner":"microsoft","products":["Microsoft .NET 10.0 runtime","Microsoft .NET 8.0 runtime","Microsoft .NET 9.0 runtime","Microsoft ASP.NET Core 10.0","Microsoft ASP.NET Core 11.0","Microsoft ASP.NET Core 8.0","Microsoft ASP.NET Core 9.0","Microsoft Microsoft Visual Studio 2022 version 17.14","Microsoft Microsoft Visual Studio 2026 version 18.9"],"affected":[{"vendor":"Microsoft","product":".NET 10.0 runtime","versions":[{"version":"10.0.0","status":"affected","lessThan":"10.0.12","versionType":"custom"}]},{"vendor":"Microsoft","product":".NET 8.0 runtime","versions":[{"version":"8.0.0","status":"affected","lessThan":"8.0.31","versionType":"custom"}]},{"vendor":"Microsoft","product":".NET 9.0 runtime","versions":[{"version":"9.0.0","status":"affected","lessThan":"9.0.20","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 10.0","versions":[{"version":"10.0","status":"affected","lessThan":"10.0.12","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 11.0","versions":[{"version":"11.0","status":"affected","lessThan":"11.0 RC1","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 8.0","versions":[{"version":"8.0","status":"affected","lessThan":"8.0.31","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 9.0","versions":[{"version":"9.0","status":"affected","lessThan":"9.0.20","versionType":"custom"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.14","versions":[{"version":"17.14.0","status":"affected","lessThan":"17.14.40","versionType":"custom"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2026 version 18.9","versions":[{"version":"18.9.0","status":"affected","lessThan":"18.9.3","versionType":"custom"}]}],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304"],"weaknesses":["CWE-409"],"ingestedAt":"2026-10-30T22:06:06.507Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/69xxx/CVE-2026-69304.json","commit":"686bbcd50f7a8fdb58e370472927aab6f903551f","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-69304","state":"PUBLISHED","datePublished":"2026-09-08T17:17:47.686Z","dateUpdated":"2026-10-30T21:56:07.330Z","assignerShortName":"microsoft","assignerOrgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","dateReserved":"2026-08-03T20:46:07.440Z"},"containers":{"cna":{"title":"ASP.NET Core Denial of Service Vulnerability","descriptions":[{"lang":"en-US","value":"Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network."}],"affected":[{"vendor":"Microsoft","product":".NET 10.0 runtime","versions":[{"version":"10.0.0","status":"affected","lessThan":"10.0.12","versionType":"custom"}]},{"vendor":"Microsoft","product":".NET 8.0 runtime","versions":[{"version":"8.0.0","status":"affected","lessThan":"8.0.31","versionType":"custom"}]},{"vendor":"Microsoft","product":".NET 9.0 runtime","versions":[{"version":"9.0.0","status":"affected","lessThan":"9.0.20","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 10.0","versions":[{"version":"10.0","status":"affected","lessThan":"10.0.12","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 11.0","versions":[{"version":"11.0","status":"affected","lessThan":"11.0 RC1","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 8.0","versions":[{"version":"8.0","status":"affected","lessThan":"8.0.31","versionType":"custom"}]},{"vendor":"Microsoft","product":"ASP.NET Core 9.0","versions":[{"version":"9.0","status":"affected","lessThan":"9.0.20","versionType":"custom"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.14","versions":[{"version":"17.14.0","status":"affected","lessThan":"17.14.40","versionType":"custom"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2026 version 18.9","versions":[{"version":"18.9.0","status":"affected","lessThan":"18.9.3","versionType":"custom"}]}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69304","name":"ASP.NET Core Denial of Service Vulnerability","tags":["vendor-advisory","patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","baseSeverity":"MEDIUM","baseScore":5.9,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en-US","type":"CWE"}]}],"providerMetadata":{"shortName":"microsoft","orgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","dateUpdated":"2026-10-30T21:56:07.330Z"},"datePublic":"2026-09-08T14:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*","versionStartIncluding":"11.0","versionEndExcluding":"11.0 RC1"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*","versionStartIncluding":"10.0.0","versionEndExcluding":"10.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*","versionStartIncluding":"9.0.0","versionEndExcluding":"9.0.20"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*","versionStartIncluding":"8.0.0","versionEndExcluding":"8.0.31"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*","versionStartIncluding":"18.9.0","versionEndExcluding":"18.9.3"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*","versionStartIncluding":"17.14.0","versionEndExcluding":"17.14.40"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*","versionStartIncluding":"9.0","versionEndExcluding":"9.0.20"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*","versionStartIncluding":"10.0","versionEndExcluding":"10.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*","versionStartIncluding":"8.0","versionEndExcluding":"8.0.31"}]}]}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-08T19:33:58.502592Z","id":"CVE-2026-69304","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-08T19:34:17.319Z"}}]}}}