What’s Vulnerable › Vulnerabilities

CVE-2021-23413: Denial of Service (DoS)

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-25 · updated 2026-06-17

Description

This affects the package jszip before 3.7.0. Crafting a new zip file with filenames set to Object prototype values (e.g __proto__, toString, etc) results in a returned object with a modified prototype instance.

Affected products

• jszip: before 3.7.0 — fixed in 3.7.0

How to fix

Upgrade to a fixed version: jszip 3.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/Stuk/jszip/blob/master/lib/object.js%23L88
• https://github.com/Stuk/jszip/commit/22357494f424178cb416cdb7d93b26dd4f824b36
• https://github.com/Stuk/jszip/pull/766
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1251499
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1251498
• https://snyk.io/vuln/SNYK-JS-JSZIP-1251497
• https://github.com/Stuk/jszip/blob/master/lib/object.js%23L88
• https://github.com/Stuk/jszip/commit/22357494f424178cb416cdb7d93b26dd4f824b36
• https://github.com/Stuk/jszip/pull/766
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1251499
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1251498
• https://snyk.io/vuln/SNYK-JS-JSZIP-1251497

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