Vulnerability in x11-server (MGASA-2026-0155)

Summary

vulnerability in x11-server (MGASA-2026-0155). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `21.1.8-7.10.mga9` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **MGASA-2026-0155** has been found in x11-server. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade x11-server to **21.1.8-7.10.mga9** or later. If unsure, ask your IT team or search "x11-server MGASA-2026-0155" on the vendor's site.

MGASA-2026-0155 (x11-server) — Patched: `21.1.8-7.10.mga9` — 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** (unclassified) exists in x11-server.

📍 Affected scope

x11-server — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **21.1.8-7.10.mga9**.

🛡️ 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 'x11-server' .` 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

1
Identify exposure identify
```
grep -r 'x11-server' . | 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 `x11-server` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade x11-server to 21.1.8-7.10.mga9
```
ステージング環境で 21.1.8-7.10.mga9 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。
7
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 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

Mageia:9 x11-server

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.1.8-7.10.mga9"}]}]

Mageia:9 x11-server-xwayland

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"22.1.9-1.10.mga9"}]}]

Mageia:9 tigervnc

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.1-2.11.mga9"}]}]