{"id":"CVE-2026-62898","title":"Microsoft QUIC Information Disclosure Vulnerability","summary":"Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-416"],"vendor":"Microsoft","product":".NET 10.0","affected":[".net_10.0 >= 10.0.0 < 10.0.11",".net_8.0 >= 8.0.0 < 8.0.30",".net_9.0 >= 9.0.0 < 9.0.19","visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.38","visual_studio_2026_version_18.8 >= 18.0 < 18.8.3"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-08-11T17:47:31.814853Z"},"published":"2026-08-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T16:26:50.336Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62898","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62898","label":"Microsoft QUIC Information Disclosure Vulnerability"},{"url":"https://github.com/dotnet/runtime/security/advisories/GHSA-c494-m2fq-59mx"},{"url":"https://github.com/dotnet/announcements/issues/426"},{"url":"https://github.com/advisories/GHSA-c494-m2fq-59mx"}],"tags":["cve.org","ghsa","nuget"],"epss":0.01112,"epssPercentile":0.6402,"aliases":["GHSA-c494-m2fq-59mx"],"ecosystem":"nuget","patched":["Microsoft.NETCore.App.Runtime.win-arm64 10.0.11","Microsoft.NETCore.App.Runtime.win-x64 10.0.11","Microsoft.NETCore.App.Runtime.win-x86 10.0.11","Microsoft.NETCore.App.Runtime.win-arm64 9.0.19","Microsoft.NETCore.App.Runtime.win-x64 9.0.19","Microsoft.NETCore.App.Runtime.win-x86 9.0.19","Microsoft.NETCore.App.Runtime.win-arm64 8.0.30","Microsoft.NETCore.App.Runtime.win-x64 8.0.30","Microsoft.NETCore.App.Runtime.win-x86 8.0.30"],"ingestedAt":"2026-08-11T18:47:43.182Z","slug":"CVE-2026-62898","body":"## Overview\n\nUse after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.\n\n## Affected\n\n- `.net_10.0 >= 10.0.0 < 10.0.11`\n- `.net_8.0 >= 8.0.0 < 8.0.30`\n- `.net_9.0 >= 9.0.0 < 9.0.19`\n- `visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.38`\n- `visual_studio_2026_version_18.8 >= 18.0 < 18.8.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-62898)\n\nAffected packages:\n\n- `Microsoft.NETCore.App.Runtime.win-arm64 >= 10.0.0, <= 10.0.10`\n- `Microsoft.NETCore.App.Runtime.win-x64 >= 10.0.0, <= 10.0.10`\n- `Microsoft.NETCore.App.Runtime.win-x86 >= 10.0.0, <= 10.0.10`\n- `Microsoft.NETCore.App.Runtime.win-arm64 >= 9.0.0, <= 9.0.18`\n- `Microsoft.NETCore.App.Runtime.win-x64 >= 9.0.0, <= 9.0.18`\n- `Microsoft.NETCore.App.Runtime.win-x86 >= 9.0.0, <= 9.0.18`\n- `Microsoft.NETCore.App.Runtime.win-arm64 >= 8.0.0, <= 8.0.29`\n- `Microsoft.NETCore.App.Runtime.win-x64 >= 8.0.0, <= 8.0.29`\n- `Microsoft.NETCore.App.Runtime.win-x86 >= 8.0.0, <= 8.0.29`\n\nPatched in:\n\n- `Microsoft.NETCore.App.Runtime.win-arm64 10.0.11`\n- `Microsoft.NETCore.App.Runtime.win-x64 10.0.11`\n- `Microsoft.NETCore.App.Runtime.win-x86 10.0.11`\n- `Microsoft.NETCore.App.Runtime.win-arm64 9.0.19`\n- `Microsoft.NETCore.App.Runtime.win-x64 9.0.19`\n- `Microsoft.NETCore.App.Runtime.win-x86 9.0.19`\n- `Microsoft.NETCore.App.Runtime.win-arm64 8.0.30`\n- `Microsoft.NETCore.App.Runtime.win-x64 8.0.30`\n- `Microsoft.NETCore.App.Runtime.win-x86 8.0.30`\n\nSource: https://github.com/advisories/GHSA-c494-m2fq-59mx","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}