{"id":"CVE-2026-58649","title":"Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.","summary":"Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cwe":["CWE-346"],"vendor":"microsoft","product":".net","affected":[".net = 11.0.0",".net_sdk >= 8.0.100, < 8.0.130",".net_sdk >= 8.0.200, < 8.0.424",".net_sdk >= 9.0.100, < 9.0.120",".net_sdk >= 9.0.200, < 9.0.317",".net_sdk >= 10.0.100, < 10.0.111",".net_sdk >= 10.0.200, < 10.0.400","visual_studio_2022 >= 17.14.0, < 17.14.40","visual_studio_2026 >= 18.9.0, < 18.9.3"],"patched":[".net_sdk 10.0.400","visual_studio_2022 17.14.40","visual_studio_2026 18.9.3"],"published":"2026-09-08","updated":"2026-10-07","sourceUpdated":"2026-10-07T15:05:42.297","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-58649","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649","label":"secure@microsoft.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58649.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-58649"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528870"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58649"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58649"},{"url":"https://github.com/dotnet/dotnet/commit/882ef164b92836bf0cabcf8eb8719274e9dc075e"},{"url":"https://github.com/dotnet/dotnet/commit/ae39133877be792de27db50aaf415b5e9f003e11"},{"url":"https://github.com/dotnet/sdk/commit/71ec9905155a8271ee90d42c20aaa54b9425f4ae"},{"url":"https://github.com/dotnet/sdk/commit/97124d73362451fe8c40ab5dbaab3396908029cb"},{"url":"https://github.com/dotnet/sdk/commit/d78666eeb83defc38c76bdf36f57a9a37b8e6e2a"},{"url":"https://github.com/dotnet/sdk/commit/de67b096e71fd0df5ebe2cfd517270651f9f8ef6"},{"url":"https://access.redhat.com/errata/RHSA-2026:67525"},{"url":"https://access.redhat.com/errata/RHSA-2026:67528"},{"url":"https://access.redhat.com/errata/RHSA-2026:67530"},{"url":"https://access.redhat.com/errata/RHSA-2026:68233"},{"url":"https://access.redhat.com/errata/RHSA-2026:67613"},{"url":"https://access.redhat.com/errata/RHSA-2026:67524"},{"url":"https://access.redhat.com/errata/RHSA-2026:67614"},{"url":"https://access.redhat.com/errata/RHSA-2026:68316"},{"url":"https://access.redhat.com/errata/RHSA-2026:68676"},{"url":"https://access.redhat.com/errata/RHSA-2026:66863"},{"url":"https://access.redhat.com/errata/RHSA-2026:77004"},{"url":"https://access.redhat.com/errata/RHSA-2026:76978"},{"url":"https://access.redhat.com/errata/RHSA-2026:88474"},{"url":"https://access.redhat.com/errata/RHSA-2026:88424"},{"url":"https://access.redhat.com/errata/RHSA-2026:88425"},{"url":"https://access.redhat.com/errata/RHSA-2026:88422"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T19:45:24.737506Z"},"epss":0.00359,"epssPercentile":0.29501,"ingestedAt":"2026-09-08T18:07:34.911Z","slug":"CVE-2026-58649","body":"## Overview\n\nOrigin validation error in .NET allows an unauthorized attacker to disclose information over a network.\n\n## Affected\n\n- `.net = 11.0.0`\n- `.net_sdk >= 8.0.100, < 8.0.130`\n- `.net_sdk >= 8.0.200, < 8.0.424`\n- `.net_sdk >= 9.0.100, < 9.0.120`\n- `.net_sdk >= 9.0.200, < 9.0.317`\n- `.net_sdk >= 10.0.100, < 10.0.111`\n- `.net_sdk >= 10.0.200, < 10.0.400`\n- `visual_studio_2022 >= 17.14.0, < 17.14.40`\n- `visual_studio_2026 >= 18.9.0, < 18.9.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `.net_sdk 10.0.400`\n- `visual_studio_2022 17.14.40`\n- `visual_studio_2026 18.9.3`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58649.json)\n- **RHSA-2026:67525** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67525)\n- **RHSA-2026:67528** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67528)\n- **RHSA-2026:67530** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67530)\n- **RHSA-2026:68233** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68233)\n- **RHSA-2026:67613** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67613)\n- **RHSA-2026:67524** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67524)\n- **RHSA-2026:67614** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67614)\n- **RHSA-2026:68316** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68316)\n- **RHSA-2026:68676** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68676)\n- **RHSA-2026:66863** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:66863)\n- **RHSA-2026:77004** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:77004)\n- **RHSA-2026:88474** · 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 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88474)\n- **RHSA-2026:88424** · 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 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88424)\n- **RHSA-2026:88425** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88425)\n- **RHSA-2026:88422** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88422)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}