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CVE-2026-21226
Unsafe Deserialization in azure-core (CVE-2026-21226)
Summary
vulnerability in azure-core (CVE-2026-21226). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `1.38.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-21226** has been found in azure-core.
Successful exploitation can lead to full system takeover. CVSS score: ?/10.
What to do: upgrade azure-core to **1.38.0** or later.
If unsure, ask your IT team or search "azure-core CVE-2026-21226" on the vendor's site.
CVE-2026-21226 (azure-core) — CWE-502 /
Attack vector: remote (network-reachable) / no user interaction
Patched: `1.38.0` — 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
**unsafe deserialization** (CWE-502) exists in azure-core.
📍 Affected scope
azure-core — .
🔥 Severity
Severity: ?. Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **1.38.0**.
🛡️ 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 'azure-core' .` 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 'azure-core' . | 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 `azure-core` 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 azure-core to 1.38.0ステージング環境で 1.38.0 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
PyPI
azure-core
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.38.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-21226
- advisory https://github.com/advisories/GHSA-jm66-cg57-jjv5
- package https://github.com/Azure/azure-sdk-for-python
- package https://pypi.org/project/azure-core
- web https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226
- web https://github.com/Azure/azure-sdk-for-python/blob/6d2e6431ea0991861640e449e51e894247a7771a/sdk/core/azure-core/CHANGELOG.md#1380-2026-01-12