{"id":"CVE-2026-50659","title":"Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.","summary":"Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-116","CWE-838"],"vendor":"microsoft","product":".net_framework","affected":[".net_framework = 4.8.1",".net_framework = 4.8",".net_framework = 4.6.2",".net_framework = 4.7",".net_framework = 4.7.1",".net_framework = 4.7.2",".net >= 8.0.0, < 8.0.29",".net >= 9.0.0, < 9.0.18",".net >= 10.0.0, < 10.0.6",".net_framework = 3.5","visual_studio_2022 >= 17.12.0, < 17.12.22","visual_studio_2022 >= 17.14.0, < 17.14.36","visual_studio_2026 >= 18.7.0, < 18.7.4"],"patched":[".net 10.0.6","visual_studio_2022 17.14.36","visual_studio_2026 18.7.4"],"published":"2026-07-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:10:00.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50659","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659","label":"secure@microsoft.com"},{"url":"https://github.com/dotnet/runtime/security/advisories/GHSA-74jp-vm22-8q8x"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50659"},{"url":"https://github.com/dotnet/announcements/issues/423"},{"url":"https://github.com/dotnet/runtime/issues/130716"},{"url":"https://github.com/advisories/GHSA-74jp-vm22-8q8x"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50659.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-50659"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2500589"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-50659"},{"url":"https://access.redhat.com/errata/RHSA-2026:58566"},{"url":"https://access.redhat.com/errata/RHSA-2026:58567"},{"url":"https://access.redhat.com/errata/RHSA-2026:41897"},{"url":"https://access.redhat.com/errata/RHSA-2026:41893"},{"url":"https://access.redhat.com/errata/RHSA-2026:41895"},{"url":"https://access.redhat.com/errata/RHSA-2026:41900"},{"url":"https://access.redhat.com/errata/RHSA-2026:41901"},{"url":"https://access.redhat.com/errata/RHSA-2026:41899"},{"url":"https://access.redhat.com/errata/RHSA-2026:58568"},{"url":"https://access.redhat.com/errata/RHSA-2026:58569"},{"url":"https://access.redhat.com/errata/RHSA-2026:58570"},{"url":"https://access.redhat.com/errata/RHSA-2026:41898"},{"url":"https://access.redhat.com/errata/RHSA-2026:41894"},{"url":"https://access.redhat.com/errata/RHSA-2026:41896"},{"url":"https://access.redhat.com/errata/RHSA-2026:26638"},{"url":"https://access.redhat.com/errata/RHSA-2026:42145"},{"url":"https://access.redhat.com/errata/RHSA-2026:39952"}],"tags":["nvd","cve.org","ghsa","nuget","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-14T20:32:29.416499Z"},"epss":0.00738,"epssPercentile":0.54324,"aliases":["GHSA-74jp-vm22-8q8x"],"ecosystem":"nuget","ingestedAt":"2026-07-20T23:44:02.730Z","slug":"CVE-2026-50659","body":"## Overview\n\nImproper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.\n\n## Affected\n\n- `.net_framework = 4.8.1`\n- `.net_framework = 4.8`\n- `.net_framework = 4.6.2`\n- `.net_framework = 4.7`\n- `.net_framework = 4.7.1`\n- `.net_framework = 4.7.2`\n- `.net >= 8.0.0, < 8.0.29`\n- `.net >= 9.0.0, < 9.0.18`\n- `.net >= 10.0.0, < 10.0.6`\n- `.net_framework = 3.5`\n- `visual_studio_2022 >= 17.12.0, < 17.12.22`\n- `visual_studio_2022 >= 17.14.0, < 17.14.36`\n- `visual_studio_2026 >= 18.7.0, < 18.7.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `.net 10.0.6`\n- `visual_studio_2022 17.14.36`\n- `visual_studio_2026 18.7.4`\n\n## Package advisory (CVE-2026-50659)\n\nAffected packages:\n\n- `Microsoft.NetCore.App.Runtime.linux-arm >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.linux-arm64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.linux-musl-x64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.linux-x64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.osx-arm64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.osx-x64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.win-arm >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.win-arm64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.win-x64 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.win-x86 >= 10.0.0, <= 10.0.9`\n- `Microsoft.NetCore.App.Runtime.linux-arm >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.linux-arm64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.linux-musl-x64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.linux-x64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.osx-arm64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.osx-x64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.win-arm >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.win-arm64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.win-x64 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.win-x86 >= 9.0.0, <= 9.0.17`\n- `Microsoft.NetCore.App.Runtime.linux-arm >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.linux-arm64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.linux-musl-x64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.linux-x64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.osx-arm64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.osx-x64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.win-arm >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.win-arm64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.win-x64 >= 8.0.0, <= 8.0.28`\n- `Microsoft.NetCore.App.Runtime.win-x86 >= 8.0.0, <= 8.0.28`\n\nPatched in:\n\n- `Microsoft.NetCore.App.Runtime.linux-arm 10.0.10`\n- `Microsoft.NetCore.App.Runtime.linux-arm64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm 10.0.10`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.linux-musl-x64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.linux-x64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.osx-arm64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.osx-x64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.win-arm 10.0.10`\n- `Microsoft.NetCore.App.Runtime.win-arm64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.win-x64 10.0.10`\n- `Microsoft.NetCore.App.Runtime.win-x86 10.0.10`\n- `Microsoft.NetCore.App.Runtime.linux-arm 9.0.18`\n- `Microsoft.NetCore.App.Runtime.linux-arm64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm 9.0.18`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.linux-musl-x64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.linux-x64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.osx-arm64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.osx-x64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.win-arm 9.0.18`\n- `Microsoft.NetCore.App.Runtime.win-arm64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.win-x64 9.0.18`\n- `Microsoft.NetCore.App.Runtime.win-x86 9.0.18`\n- `Microsoft.NetCore.App.Runtime.linux-arm 8.0.29`\n- `Microsoft.NetCore.App.Runtime.linux-arm64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm 8.0.29`\n- `Microsoft.NetCore.App.Runtime.linux-musl-arm64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.linux-musl-x64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.linux-x64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.osx-arm64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.osx-x64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.win-arm 8.0.29`\n- `Microsoft.NetCore.App.Runtime.win-arm64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.win-x64 8.0.29`\n- `Microsoft.NetCore.App.Runtime.win-x86 8.0.29`\n\nSource: https://github.com/advisories/GHSA-74jp-vm22-8q8x\n\n## Vendor advisories\n\n- **RHSA-2026:58566** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58566)\n- **RHSA-2026:58567** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58567)\n- **RHSA-2026:41897** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41897)\n- **RHSA-2026:41893** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41893)\n- **RHSA-2026:41895** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41895)\n- **RHSA-2026:41900** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41900)\n- **RHSA-2026:41901** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41901)\n- **RHSA-2026:41899** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41899)\n- **RHSA-2026:58568** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58568)\n- **RHSA-2026:58569** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58569)\n- **RHSA-2026:58570** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58570)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}