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CVE-2026-50648
high
CVSS 7.5
Vulnerability in System.Security.Cryptography.Xml (CVE-2026-50648)
Summary
vulnerability in System.Security.Cryptography.Xml (CVE-2026-50648). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `8.0.4` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-50648** has been found in System.Security.Cryptography.Xml.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade System.Security.Cryptography.Xml to **8.0.4** or later.
If unsure, ask your IT team or search "System.Security.Cryptography.Xml CVE-2026-50648" on the vendor's site.
CVE-2026-50648 (System.Security.Cryptography.Xml) — CWE-770 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `8.0.4` — 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-770) exists in System.Security.Cryptography.Xml.
📍 Affected scope
System.Security.Cryptography.Xml — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **8.0.4**.
🛡️ 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 'System.Security.Cryptography.Xml' .` 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 'System.Security.Cryptography.Xml' . | 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 `System.Security.Cryptography.Xml` 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 System.Security.Cryptography.Xml to 8.0.4ステージング環境で 8.0.4 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
System.Security.Cryptography.Xml
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.4"}]}]
References
- patch [email protected]
- web https://github.com/dotnet/runtime/security/advisories/GHSA-23rf-6693-g89p
- web https://nvd.nist.gov/vuln/detail/CVE-2026-50648
- web https://github.com/dotnet/announcements/issues/419
- web https://github.com/dotnet/runtime/issues/130714
- web https://github.com/advisories/GHSA-23rf-6693-g89p