Vulnerability in class-transformer (CVE-2020-7637)
Summary
Vulnerability in class-transformer (CVE-2020-7637). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.3.1 or later.
Original description
The description as published by the source.
class-transformer before 0.3.1 allow attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a proto payload.
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-2020-7637 has been found in class-transformer.
Risk of unauthorized operations or information disclosure.
What to do: upgrade class-transformer to 0.3.1 or later.
If unsure, ask your IT team or search "class-transformer CVE-2020-7637" on the vendor's site.
CVE-2020-7637 (class-transformer) — CWE-1321
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 0.3.1 — 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-1321) exists in class-transformer.
Check the vendor advisory for the affected versions of class-transformer.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 0.3.1.
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 'class-transformer' . 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
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1Identify exposure identify
grep -r 'class-transformer' . | 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
class-transformer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 class-transformer to 0.3.1ステージング環境で 0.3.1 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 nvd.nist.gov
- package github.com
- patch github.com
- report snyk.io
- web github.com