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Vulnerability record · CVE-2022-24999 · published 26 November 2022

CVE-2022-24999: Qs project qs prototype pollution vulnerability

QQs Project · Qs

qs before 6.10.3, as used in Express before 4.17.3 and other products, allows attackers to cause a Node process hang for an Express application because an __ proto__ key can be used. In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as a[__proto__]=b&a[__proto__]&a[length]=100000000. The fix was backported to qs 6.9.7, 6.8.3, 6.7.3, 6.6.1, 6.5.3, 6.4.1, 6.3.3, and 6.2.4 (and therefore Express 4.17.3, which has "deps: [email protected]" in its release description, is not vulnerable).

7.5 CVSS 3.1 High EPSS 16% · top 3.3% CWE-1321 · Prototype pollution
7.5CVSS 3.1 base score
16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

qs before 6.10.3, as used in Express before 4.17.3 and other products, allows attackers to cause a Node process hang for an Express application because an __ proto__ key can be used. In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as a[__proto__]=b&a[__proto__]&a[length]=100000000. The fix was backported to qs 6.9.7, 6.8.3, 6.7.3, 6.6.1, 6.5.3, 6.4.1, 6.3.3, and 6.2.4 (and therefore Express 4.17.3, which has "deps: [email protected]" in its release description, is not vulnerable).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/expressjs/express/releases/tag/4.17.3 Release Notes
https://github.com/ljharb/qs/pull/428 Issue TrackingPatch
https://github.com/n8tz/CVE-2022-24999 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/01/msg00039.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20230908-0005/
https://github.com/expressjs/express/releases/tag/4.17.3 Release Notes
https://github.com/ljharb/qs/pull/428 Issue TrackingPatch
https://github.com/n8tz/CVE-2022-24999 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/01/msg00039.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20230908-0005/

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Source: NIST National Vulnerability Database (record CVE-2022-24999), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.