CVE-2021-23413

MEDIUMNVD 5.35.3—

5.3

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.

CVSS v3: 5.3
EG Score: 5.3(medium)
EPSS: 79.3%
KEV: Not listed

Published

July 25, 2021

Last Modified

November 21, 2024

References (12)

report@snykhttps://github.com/Stuk/jszip/blob/master/lib/object.js%23L88
report@snykhttps://github.com/Stuk/jszip/commit/22357494f424178cb416cdb7d93b26dd4f824b36
report@snykhttps://github.com/Stuk/jszip/pull/766
report@snykhttps://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1251499
report@snykhttps://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1251498
report@snykhttps://snyk.io/vuln/SNYK-JS-JSZIP-1251497
af854a3a-2127-422b-91ae-364da2661108https://github.com/Stuk/jszip/blob/master/lib/object.js%23L88
af854a3a-2127-422b-91ae-364da2661108https://github.com/Stuk/jszip/commit/22357494f424178cb416cdb7d93b26dd4f824b36
af854a3a-2127-422b-91ae-364da2661108https://github.com/Stuk/jszip/pull/766
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1251499
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1251498
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JS-JSZIP-1251497

Affected Packages

(1 across 1 ecosystem)

npm(1)

Package	Vulnerable range	Fixed in	Dependents
jszip	—	2.7.0	—

Data Freshness Timeline

(refreshed 11× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:04 UTCEG score recompute
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch

Frequently asked(5)

What is CVE-2021-23413?

CVE-2021-23413 is a medium vulnerability published on July 25, 2021. 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.

When was CVE-2021-23413 disclosed?

CVE-2021-23413 was first published in the National Vulnerability Database on July 25, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-23413 actively exploited?

CVE-2021-23413 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-23413?

CVE-2021-23413 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2021-23413?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-23413, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-23413

📅 Published

🔄 Last Modified

🔗 References (12)