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CVE-2026-32175 medium CVSS 4.3

Path Traversal in Microsoft.NetCore.App.Runtime.win-arm (CVE-2026-32175)

Summary

Path traversal in Microsoft.NetCore.App.Runtime.win-arm (CVE-2026-32175). Data can be tampered with by attackers. Mitigation: upgrade to 10.0.8 or later.

Original description

The description as published by the source.

Executive Summary:

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0, .NET 9.0, and .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A tampering vulnerability exists when .NET Core improperly handles specially crafted files. An attacker who successfully exploited this vulnerability could write arbitrary files and directories to certain locations on a vulnerable system. However, an attacker would have limited control over the destination of the files and directories.

To exploit the vulnerability, an attacker must send a specially crafted file to a vulnerable system.

The security update fixes the vulnerability by ensuring .NET Core properly handles files.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/396

CVSS Details

  • Version: 3.1
  • Severity:
  • Score: 4.3
  • Vector: /AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  • Weakness: CWE-36: Absolute Path Traversal

Affected Platforms

  • Platforms: Windows
  • Architectures: All

Affected Packages

The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below

.NET 10

Package name Affected version Patched version
[Microsoft.NetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Micro…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-32175 has been found in Microsoft.NetCore.App.Runtime.win-arm.
Data can be tampered with by attackers. CVSS score: 4.3/10.
What to do: upgrade Microsoft.NetCore.App.Runtime.win-arm to 10.0.8 or later.
If unsure, ask your IT team or search "Microsoft.NetCore.App.Runtime.win-arm CVE-2026-32175" on the vendor's site.

CVE-2026-32175 (Microsoft.NetCore.App.Runtime.win-arm) — CWE-22 / CVSS v3 4.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 10.0.8 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Path traversal (CWE-22) exists in Microsoft.NetCore.App.Runtime.win-arm.

📍 Affected scope

Check the vendor advisory for the affected versions of Microsoft.NetCore.App.Runtime.win-arm.

🔥 Severity

Severity: Medium (CVSS 4.3/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 10.0.8.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Microsoft.NetCore.App.Runtime.win-arm' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'Microsoft.NetCore.App.Runtime.win-arm' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で Microsoft.NetCore.App.Runtime.win-arm を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade Microsoft.NetCore.App.Runtime.win-arm to 10.0.8

    ステージング環境で 10.0.8 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

nuget Microsoft.NetCore.App.Runtime.win-arm
[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0"},{"fixed":"10.0.8"}]}]
nuget Microsoft.NetCore.App.Runtime.win-arm64
[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0"},{"fixed":"10.0.8"}]}]
nuget Microsoft.NetCore.App.Runtime.win-x64
[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0"},{"fixed":"10.0.8"}]}]
nuget Microsoft.NetCore.App.Runtime.win-x86
[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0"},{"fixed":"10.0.8"}]}]
Bitnami dotnet
[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.0.27"},{"introduced":"9.0.0"},{"fixed":"9.0.16"}]}]
Bitnami dotnet-sdk
[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.0.27"},{"introduced":"9.0.0"},{"fixed":"9.0.16"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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