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CVE-2026-45491
medium
CVSS 6.2
Vulnerability in Microsoft.NETCore.App.Runtime.linux-x64 (CVE-2026-45491)
Summary
vulnerability in Microsoft.NETCore.App.Runtime.linux-x64 (CVE-2026-45491). Data can be tampered with by attackers. Exploitable via ``TarFile.ExtractToDirectory``. Mitigation: upgrade to `10.0.9` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-45491** has been found in Microsoft.NETCore.App.Runtime.linux-x64.
Attackers can target a specific entry point like ``TarFile.ExtractToDirectory`` over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 6.2/10.
What to do: upgrade Microsoft.NETCore.App.Runtime.linux-x64 to **10.0.9** or later.
If unsure, ask your IT team or search "Microsoft.NETCore.App.Runtime.linux-x64 CVE-2026-45491" on the vendor's site.
CVE-2026-45491 (Microsoft.NETCore.App.Runtime.linux-x64) — CWE-59 / CVSS v3 6.2
Attack vector: local / unauthenticated / no user interaction
Attack surface: `TarFile.ExtractToDirectory`
Patched: `10.0.9` — 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.NETCore.App.Runtime.linux-x64. Attackers reach the vulnerable code path via ``TarFile.ExtractToDirectory`` without authentication.
📍 Affected scope
Microsoft.NETCore.App.Runtime.linux-x64 — . Attack surface: `TarFile.ExtractToDirectory`.
🔥 Severity
Severity: Medium (CVSS 6.2/10). Data can be tampered with by attackers
🔧 How to fix
Update to **10.0.9**.
🛡️ 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.linux-x64' .` 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
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1Identify exposure identify
grep -r 'Microsoft.NETCore.App.Runtime.linux-x64' . | 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.linux-x64` 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.NETCore.App.Runtime.linux-x64 to 10.0.9ステージング環境で 10.0.9 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.NETCore.App.Runtime.linux-x64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.9"}]}]
nuget
Microsoft.NETCore.App.Runtime.win-x64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.9"}]}]
nuget
Microsoft.NETCore.App.Runtime.osx-arm64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.9"}]}]