---
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 10.0
affected:
  - '.net_10.0 >= 10.0.0 < 10.0.111, 10.0.400'
  - .net_11.0 >= 11.0.0 < 11.0 RC1
  - '.net_8.0 >= 8.0.0 < 8.0.130, 8.0.424'
  - '.net_9.0 >= 9.0.0 < 9.0.120, 9.0.317'
  - visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.40
  - visual_studio_2026_version_18.9 >= 18.9.0 < 18.9.3
published: '2026-09-08'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:17:35.987'
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'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T19:45:24.737506Z'
ingestedAt: '2026-09-08T18:07:34.911Z'
epss: 0.00272
epssPercentile: 0.19844
patched:
  - enterprise_linux_appstream_v_10
  - enterprise_linux_codeready_linux_builder_v_10
---

## Overview

Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **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)
- **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)
- **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)
- **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)
- **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)
- **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)
- **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)
- **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)
- **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)
- **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)