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CVE-2019-18197 high CVSS 7.5

Use-After-Free in nokogiri (CVE-2019-18197)

Summary

Vulnerability in nokogiri (CVE-2019-18197). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.10.5 or later.

Original description

The description as published by the source.

In xsltCopyText in transform.c in libxslt 1.1.33, a pointer variable isn't reset under certain circumstances. If the relevant memory area happened to be freed and reused in a certain way, a bounds check could fail and memory outside a buffer could be written to, or uninitialized data could be disclosed.

Nokogiri prior to version 1.10.5 contains a vulnerable version of libxslt. Nokogiri version 1.10.5 upgrades the dependency to libxslt 1.1.34, which contains a patch for this issue.

Source: NIST National Vulnerability Database 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-2019-18197 has been found in nokogiri.
Successful exploitation can lead to full system takeover. CVSS score: 7.5/10.
What to do: upgrade nokogiri to 1.10.5 or later.
If unsure, ask your IT team or search "nokogiri CVE-2019-18197" on the vendor's site.

CVE-2019-18197 (nokogiri) — CWE-416 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated
Patched: 1.10.5 — 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

Use-after-free (CWE-416) exists in nokogiri.

📍 Affected scope

Check the vendor advisory for the affected versions of nokogiri.

🔥 Severity

Severity: High (CVSS 7.5/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.10.5.

🛡️ 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 'nokogiri' . 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 'nokogiri' . | 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 nokogiri 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 nokogiri to 1.10.5

    ステージング環境で 1.10.5 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

rubygems nokogiri
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.5"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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