CVE-2022-24999: Debian Linux

High severity, CVSS 7.5. EPSS: 15.6% chance of exploitation in the next 30 days.

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: qs@6.9.7" in its release description, is not vulnerable).

Affected products

• Debian Debian Linux: version 10.0 only
• Openjsf Express: before 4.17.3 (fixed in 4.17.3)
• Qs Project Qs: before 6.2.4 (fixed in 6.2.4); from 6.3.0, before 6.3.3 (fixed in 6.3.3); from 6.5.0, before 6.5.3 (fixed in 6.5.3); from 6.7.0, before 6.7.3 (fixed in 6.7.3); from 6.8.0, before 6.8.3 (fixed in 6.8.3); from 6.9.0, before 6.9.7 (fixed in 6.9.7); …

Published 2022-11-26. Last modified 2026-06-17.