{"id":"CVE-2026-62899","aliases":[],"cve":{"records":[{"id":"CVE-2026-62899","source":"microsoft","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-07-14T21:25:21.035Z","published":"2026-08-11T17:04:40.045Z","modified":"2026-10-30T17:20:27.421Z"}],"publishers":[{"name":"microsoft","role":"CNA","organizationId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","modified":"2026-10-30T17:20:27.421Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-08-12T13:52:41.999Z"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62899","tags":["vendor-advisory","patch"],"source":"microsoft"}],"weaknesses":[{"id":"CWE-444","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","source":"microsoft"}],"applicability":[{"source":"microsoft","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*","versionStartIncluding":"10.0.0","versionEndExcluding":"10.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*","versionStartIncluding":"8.0.0","versionEndExcluding":"8.0.30"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*","versionStartIncluding":"9.0.0","versionEndExcluding":"9.0.19"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*","versionStartIncluding":"17.14.0","versionEndExcluding":"17.14.38"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*","versionStartIncluding":"18.0","versionEndExcluding":"18.8.3"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-08-12T13:48:04.279657Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":".NET Security Feature Bypass Vulnerability","titleSource":"microsoft","descriptionSource":"microsoft","description":"Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.","score":5.9,"severity":"medium","published":"2026-08-11T17:04:40.045Z","modified":"2026-10-30T17:20:27.421Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Microsoft","name":".NET 10.0 runtime","platforms":[],"versions":[{"version":"10.0.0","status":"affected","lessThan":"10.0.11","versionType":"custom"}],"cpes":[],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-62899"},{"vendor":"Microsoft","name":".NET 8.0 runtime","platforms":[],"versions":[{"version":"8.0.0","status":"affected","lessThan":"8.0.30","versionType":"custom"}],"cpes":[],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-62899"},{"vendor":"Microsoft","name":".NET 9.0 runtime","platforms":[],"versions":[{"version":"9.0.0","status":"affected","lessThan":"9.0.19","versionType":"custom"}],"cpes":[],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-62899"},{"vendor":"Microsoft","name":"Microsoft Visual Studio 2022 version 17.14","platforms":[],"versions":[{"version":"17.14.0","status":"affected","lessThan":"17.14.38","versionType":"custom"}],"cpes":[],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-62899"},{"vendor":"Microsoft","name":"Microsoft Visual Studio 2026 version 18.8","platforms":[],"versions":[{"version":"18.0","status":"affected","lessThan":"18.8.3","versionType":"custom"}],"cpes":[],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-62899"}],"remediation":[],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62899"],"sources":[{"name":"CVE","id":"CVE-2026-62899","modified":"2026-10-30T17:20:27.421Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-62899"}],"assessments":[{"source":"microsoft","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","score":5.9}],"sourceAffected":[],"observedAt":"2026-10-30T18:44:41.048Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T10:20:31.211Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"The .NET 8.0, 9.0, and 10.0 runtimes, and Microsoft Visual Studio 2022 and 2026, are affected by a security feature bypass vulnerability due to inconsistent interpretation of HTTP requests. An attacker with network access can exploit this weakness. The impact is a security feature bypass.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:11:13.128Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-62899"}]}}