{"id":"CVE-2026-70197","title":"Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.","summary":"Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787"],"published":"2026-10-13","updated":"2026-10-14","sourceUpdated":"2026-10-14T04:18:33.297","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70197","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70197","label":"secure@microsoft.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-70197.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-70197"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2551007"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-70197"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70197"},{"url":"https://github.com/dotnet/runtime/security/advisories/GHSA-4mpw-cpwj-hxxj"},{"url":"https://github.com/dotnet/announcements/issues/466"},{"url":"https://github.com/dotnet/runtime/issues/135702"},{"url":"https://github.com/advisories/GHSA-4mpw-cpwj-hxxj"}],"tags":["nvd","cve.org","csaf","vex","red-hat","ghsa","nuget"],"ingestedAt":"2026-10-13T19:43:29.024Z","vendor":"Microsoft","product":".NET 10.0","affected":[".net_10.0 >= 10.0.0 < 10.0.13",".net_11.0 >= 11.0.0 < 11.0.0-rc.2",".net_8.0 >= 8.0.0 < 8.0.32",".net_9.0 >= 9.0.0 < 9.0.21","visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.42","visual_studio_2026_version_18.10 >= 18.10.0 < 18.10.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-08T00:00:00+00:00"},"epss":0.00788,"epssPercentile":0.56006,"aliases":["GHSA-4mpw-cpwj-hxxj"],"ecosystem":"nuget","patched":["Microsoft.NETCore.App.Runtime.win-arm64 8.0.32","Microsoft.NETCore.App.Runtime.win-x64 8.0.32","Microsoft.NETCore.App.Runtime.win-x86 8.0.32","Microsoft.NETCore.App.Runtime.win-arm64 11.0.0-rc.2","Microsoft.NETCore.App.Runtime.win-x64 11.0.0-rc.2","Microsoft.NETCore.App.Runtime.win-x86 11.0.0-rc.2","Microsoft.NETCore.App.Runtime.win-arm64 9.0.21","Microsoft.NETCore.App.Runtime.win-x64 9.0.21","Microsoft.NETCore.App.Runtime.win-x86 9.0.21","Microsoft.NETCore.App.Runtime.win-arm64 10.0.13","Microsoft.NETCore.App.Runtime.win-x64 10.0.13","Microsoft.NETCore.App.Runtime.win-x86 10.0.13"],"slug":"CVE-2026-70197","body":"## Overview\n\nOut-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-70197.json)\n\n## Package advisory (CVE-2026-70197)\n\nAffected packages:\n\n- `Microsoft.NETCore.App.Runtime.win-arm64 >= 8.0.0, <= 8.0.31`\n- `Microsoft.NETCore.App.Runtime.win-x64 >= 8.0.0, <= 8.0.31`\n- `Microsoft.NETCore.App.Runtime.win-x86 >= 8.0.0, <= 8.0.31`\n- `Microsoft.NETCore.App.Runtime.win-arm64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`\n- `Microsoft.NETCore.App.Runtime.win-x64 >= 11.0.0-preview.1, <= 11.0.0-rc.1`\n- `Microsoft.NETCore.App.Runtime.win-x86 >= 11.0.0-preview.1, <= 11.0.0-rc.1`\n- `Microsoft.NETCore.App.Runtime.win-arm64 >= 9.0.0, <= 9.0.20`\n- `Microsoft.NETCore.App.Runtime.win-x64 >= 9.0.0, <= 9.0.20`\n- `Microsoft.NETCore.App.Runtime.win-x86 >= 9.0.0, <= 9.0.20`\n- `Microsoft.NETCore.App.Runtime.win-arm64 >= 10.0.0, <= 10.0.12`\n- `Microsoft.NETCore.App.Runtime.win-x64 >= 10.0.0, <= 10.0.12`\n- `Microsoft.NETCore.App.Runtime.win-x86 >= 10.0.0, <= 10.0.12`\n\nPatched in:\n\n- `Microsoft.NETCore.App.Runtime.win-arm64 8.0.32`\n- `Microsoft.NETCore.App.Runtime.win-x64 8.0.32`\n- `Microsoft.NETCore.App.Runtime.win-x86 8.0.32`\n- `Microsoft.NETCore.App.Runtime.win-arm64 11.0.0-rc.2`\n- `Microsoft.NETCore.App.Runtime.win-x64 11.0.0-rc.2`\n- `Microsoft.NETCore.App.Runtime.win-x86 11.0.0-rc.2`\n- `Microsoft.NETCore.App.Runtime.win-arm64 9.0.21`\n- `Microsoft.NETCore.App.Runtime.win-x64 9.0.21`\n- `Microsoft.NETCore.App.Runtime.win-x86 9.0.21`\n- `Microsoft.NETCore.App.Runtime.win-arm64 10.0.13`\n- `Microsoft.NETCore.App.Runtime.win-x64 10.0.13`\n- `Microsoft.NETCore.App.Runtime.win-x86 10.0.13`\n\nSource: https://github.com/advisories/GHSA-4mpw-cpwj-hxxj","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}