Vulnerability in lol-html (CVE-2023-4241)
Summary
Vulnerability in lol-html (CVE-2023-4241). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.1.1 or later.
Original description
The description as published by the source.
lol-html can cause panics on certain HTML inputs. Anyone processing arbitrary 3rd party HTML with the library is affected.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2023-4241 has been found in lol-html.
Risk of unauthorized operations or information disclosure.
What to do: upgrade lol-html to 1.1.1 or later.
If unsure, ask your IT team or search "lol-html CVE-2023-4241" on the vendor's site.
CVE-2023-4241 (lol-html) — CWE-20
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.1.1 — 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.
A vulnerability (CWE-20) exists in lol-html.
Check the vendor advisory for the affected versions of lol-html.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.1.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'lol-html' . 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
-
1Identify exposure identify
grep -r 'lol-html' . | 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
lol-htmlを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade lol-html to 1.1.1ステージング環境で 1.1.1 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。
-
3Post-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
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com