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CVE-2026-50526
high
CVSS 7.0
Vulnerability in Microsoft.NET.Build.Containers (CVE-2026-50526)
Summary
vulnerability in Microsoft.NET.Build.Containers (CVE-2026-50526). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `8.0.29` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-50526** has been found in Microsoft.NET.Build.Containers.
Successful exploitation can lead to full system takeover. CVSS score: 7.0/10.
What to do: upgrade Microsoft.NET.Build.Containers to **8.0.29** or later.
If unsure, ask your IT team or search "Microsoft.NET.Build.Containers CVE-2026-50526" on the vendor's site.
CVE-2026-50526 (Microsoft.NET.Build.Containers) — CWE-59 / CVSS v3 7.0
Attack vector: local / no user interaction
Patched: `8.0.29` — 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
**A vulnerability** (CWE-59) exists in Microsoft.NET.Build.Containers.
📍 Affected scope
Microsoft.NET.Build.Containers — .
🔥 Severity
Severity: High (CVSS 7.0/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **8.0.29**.
🛡️ 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.NET.Build.Containers' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Microsoft.NET.Build.Containers' . | 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.NET.Build.Containers` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade Microsoft.NET.Build.Containers to 8.0.29ステージング環境で 8.0.29 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
nuget
Microsoft.NET.Build.Containers
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.29"}]}]
References
- patch [email protected]
- web https://github.com/dotnet/sdk/security/advisories/GHSA-55jh-fwmh-39m4
- web https://nvd.nist.gov/vuln/detail/CVE-2026-50526
- web https://github.com/dotnet/announcements/issues/415
- web https://github.com/dotnet/sdk/issues/55274
- web https://github.com/advisories/GHSA-55jh-fwmh-39m4