{"cve":"CVE-2022-24999","nvd":{"published":"2022-11-26T22:15:10.153","modified":"2026-06-17T04:32:55.200","status":"Modified","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: qs@6.9.7\" in its release description, is not vulnerable).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1321"],"references":["https://github.com/expressjs/express/releases/tag/4.17.3","https://github.com/ljharb/qs/pull/428","https://github.com/n8tz/CVE-2022-24999","https://lists.debian.org/debian-lts-announce/2023/01/msg00039.html","https://security.netapp.com/advisory/ntap-20230908-0005/"],"products":["debian:debian_linux","openjsf:express","qs_project:qs"],"source":"nvd","synced_at":"2026-10-19T21:37:28.463369388+00:00"},"epss":{"cve":"CVE-2022-24999","score":0.15622,"percentile":0.96843,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-hrpp-h998-j3pp","url":"https://osv.dev/vulnerability/GHSA-hrpp-h998-j3pp","summary":"qs vulnerable to Prototype Pollution","modified":"2025-04-29T15:41:43Z","packages":[{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.10.0 <6.10.3"],"fixed":["6.10.3"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.9.0 <6.9.7"],"fixed":["6.9.7"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.8.0 <6.8.3"],"fixed":["6.8.3"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.7.0 <6.7.3"],"fixed":["6.7.3"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.6.0 <6.6.1"],"fixed":["6.6.1"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.5.0 <6.5.3"],"fixed":["6.5.3"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.4.0 <6.4.1"],"fixed":["6.4.1"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":[">=6.3.0 <6.3.3"],"fixed":["6.3.3"]},{"ecosystem":"npm","name":"qs","purl":"pkg:npm/qs","ranges":["<6.2.4"],"fixed":["6.2.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}