What’s Vulnerable › Vulnerabilities

CVE-2020-7748: Prototype Pollution

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-20 · updated 2026-06-17
• Weakness: CWE-1321

Description

This affects the package @tsed/core before 5.65.7. This vulnerability relates to the deepExtend function which is used as part of the utils directory. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.

Affected products

• Ts.Ed Project Ts.Ed: before 5.65.7 — fixed in 5.65.7

How to fix

Upgrade to a fixed version: Ts.Ed Project Ts.Ed 5.65.7. Check the vendor advisory for mitigations.

References

• https://github.com/TypedProject/tsed/blob/production/packages/core/src/utils/deepExtends.ts%23L36
• https://github.com/TypedProject/tsed/commit/1395773ddac35926cf058fc6da9fb8e82266761b
• https://snyk.io/vuln/SNYK-JS-TSEDCORE-1019382
• https://github.com/TypedProject/tsed/blob/production/packages/core/src/utils/deepExtends.ts%23L36
• https://github.com/TypedProject/tsed/commit/1395773ddac35926cf058fc6da9fb8e82266761b
• https://snyk.io/vuln/SNYK-JS-TSEDCORE-1019382

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