Vulnerability in lxml (CVE-2014-3146)

Summary

vulnerability in lxml (CVE-2014-3146). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `3.3.5` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2014-3146** has been found in lxml. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade lxml to **3.3.5** or later. If unsure, ask your IT team or search "lxml CVE-2014-3146" on the vendor's site.

CVE-2014-3146 (lxml) — Patched: `3.3.5` — 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 lxml.

📍 Affected scope

lxml — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **3.3.5**.

🛡️ 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 'lxml' .` 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 'lxml' . | 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 `lxml` 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 lxml to 3.3.5
```
ステージング環境で 3.3.5 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

PyPI lxml

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.5"}]}]

References

advisory http://secunia.com/advisories/58013
advisory http://www.ubuntu.com/usn/USN-2217-1
advisory http://secunia.com/advisories/58744
advisory http://secunia.com/advisories/59008
advisory http://www.mandriva.com/security/advisories?name=MDVSA-2015:112
advisory http://advisories.mageia.org/MGASA-2014-0218.html
advisory http://www.debian.org/security/2014/dsa-2941
advisory https://github.com/advisories/GHSA-57qw-cc2g-pv5p
web http://lxml.de/3.3/changes-3.3.5.html
web http://seclists.org/fulldisclosure/2014/Apr/210
web http://www.securityfocus.com/bid/67159
web http://www.openwall.com/lists/oss-security/2014/05/09/7
web http://seclists.org/fulldisclosure/2014/Apr/319
web https://mailman-mail5.webfaction.com/pipermail/lxml/2014-April/007128.html
web http://lists.opensuse.org/opensuse-updates/2014-05/msg00083.html