Vulnerability in apache2 (USN-8239-1)

Summary

vulnerability in apache2 (USN-8239-1). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `2.4.52-1ubuntu4.20` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **USN-8239-1** has been found in apache2. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade apache2 to **2.4.52-1ubuntu4.20** or later. If unsure, ask your IT team or search "apache2 USN-8239-1" on the vendor's site.

USN-8239-1 (apache2) — Patched: `2.4.52-1ubuntu4.20` — 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 apache2.

📍 Affected scope

apache2 — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **2.4.52-1ubuntu4.20**.

🛡️ 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 'apache2' .` 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 'apache2' . | 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 `apache2` 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 apache2 to 2.4.52-1ubuntu4.20
```
ステージング環境で 2.4.52-1ubuntu4.20 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

Ubuntu:22.04:LTS apache2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.52-1ubuntu4.20"}]}]

Ubuntu:24.04:LTS apache2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.58-1ubuntu8.12"}]}]

Ubuntu:25.10 apache2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.64-1ubuntu3.4"}]}]

Ubuntu:26.04 apache2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.66-2ubuntu2.1"}]}]

References

advisory https://ubuntu.com/security/notices/USN-8239-1
report https://ubuntu.com/security/CVE-2026-23918
report https://ubuntu.com/security/CVE-2026-24072
report https://ubuntu.com/security/CVE-2026-28780
report https://ubuntu.com/security/CVE-2026-29168
report https://ubuntu.com/security/CVE-2026-29169
report https://ubuntu.com/security/CVE-2026-33006
report https://ubuntu.com/security/CVE-2026-33007
report https://ubuntu.com/security/CVE-2026-33523
report https://ubuntu.com/security/CVE-2026-33857
report https://ubuntu.com/security/CVE-2026-34032
report https://ubuntu.com/security/CVE-2026-34059