Vulnerability in handlebars (CVE-2019-20922)
Summary
Vulnerability in handlebars (CVE-2019-20922). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.4.5 or later.
Original description
The description as published by the source.
Handlebars before 4.4.5 allows Regular Expression Denial of Service (ReDoS) because of eager matching. The parser may be forced into an endless loop while processing crafted templates. This may allow attackers to exhaust system resources.
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-2019-20922 has been found in handlebars.
Risk of unauthorized operations or information disclosure.
What to do: upgrade handlebars to 4.4.5 or later.
If unsure, ask your IT team or search "handlebars CVE-2019-20922" on the vendor's site.
CVE-2019-20922 (handlebars) — CWE-400
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 4.4.5 — 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.
A vulnerability (CWE-400) exists in handlebars.
Check the vendor advisory for the affected versions of handlebars.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 4.4.5.
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 'handlebars' . 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 'handlebars' . | 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
handlebars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 handlebars to 4.4.5ステージング環境で 4.4.5 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。
-
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 nvd.nist.gov
- web github.com
- web snyk.io
- web npmjs.com
- web npmjs.com