Medium severity5.3NVD Advisory· Published Apr 6, 2020· Updated Jun 17, 2026
CVE-2020-7637
CVE-2020-7637
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
class-transformernpm | < 0.3.1 | 0.3.1 |
Affected products
3- cpe:2.3:a:class-transformer_project:class-transformer:*:*:*:*:*:node.js:*:*Range: <0.3.1
- class-transformer/class-transformerdescription
Patches
Vulnerability mechanics
References
5- github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01envdPatchThird Party AdvisoryWEB
- snyk.io/vuln/SNYK-JS-CLASSTRANSFORMER-564431nvdExploitThird Party AdvisoryWEB
- github.com/advisories/GHSA-6gp3-h3jj-prx4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-7637ghsaADVISORY
- github.com/typestack/class-transformer/blob/a650d9f490573443f62508bc063b857bcd5e2525/src/ClassTransformer.tsghsaWEB
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