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CVE-2026-12249 critical CVSS 9.0

Vulnerability in github.com/ubuntu/adsys (CVE-2026-12249)

Summary

Vulnerability in github.com/ubuntu/adsys (CVE-2026-12249). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 0.16.3-0.20250318112551-8b1939f96d38 or later.

Original description

The description as published by the source.

An issue was discovered in Canonical ADSys upstream versions through v0.16.2. During Active Directory Certificate Services (AD CS) certificate auto-enrollment via the vendored Samba client script (internal/policies/certificate/python/vendor_samba/gp/gp_cert_auto_enroll_ext.py), ADSys utilizes a plaintext HTTP connection (http://) instead of a secure HTTPS connection (https://) to request the CA certificate from the Active Directory Certificate Services server (GetCACert). An unauthenticated network attacker positioned between the managed Ubuntu host and the configured AD CS CA hostname can conduct a Man-in-the-Middle (MITM) attack. By intercepting the plaintext HTTP request, the attacker can supply an arbitrary, attacker-controlled Root CA certificate. Because the system automatically accepts this certificate and registers it into the local system trust store via update-ca-certificates, this results in system-wide trust store poisoning. Consequently, TLS clients utilizing the operating system trust store on the affected machine will accept rogue certificates for arbitrary domains, enabling persistent decryption and interception of subsequent TLS connections. This issue is resolved in version v0.16.3.

Source: GitHub Security Advisories (Global) 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-2026-12249 has been found in github.com/ubuntu/adsys.
Successful exploitation can lead to full system takeover. CVSS score: 9.0/10.
What to do: upgrade github.com/ubuntu/adsys to 0.16.3-0.20250318112551-8b1939f96d38 or later.
If unsure, ask your IT team or search "github.com/ubuntu/adsys CVE-2026-12249" on the vendor's site.

CVE-2026-12249 (github.com/ubuntu/adsys) — CWE-348 / CVSS v3 9.0
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 0.16.3-0.20250318112551-8b1939f96d38 — 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-348) exists in github.com/ubuntu/adsys.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/ubuntu/adsys.

🔥 Severity

Severity: Critical (CVSS 9.0/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 0.16.3-0.20250318112551-8b1939f96d38.

🛡️ 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 'github.com/ubuntu/adsys' . 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 'github.com/ubuntu/adsys' . | 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 github.com/ubuntu/adsys 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 github.com/ubuntu/adsys to 0.16.3-0.20250318112551-8b1939f96d38

    ステージング環境で 0.16.3-0.20250318112551-8b1939f96d38 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

go github.com/ubuntu/adsys
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.3-0.20250318112551-8b1939f96d38"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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