CVE-2022-24999
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 15.7%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 15.70% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-1321
- Affected
- qs project/qs · openjsf/express · debian/debian linux
- Source
- cve@mitre.org
EPSS 15.7% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/expressjs/express/releases/tag/4.17.3Release Notes
- https://github.com/ljharb/qs/pull/428Issue Tracking, Patch
- https://github.com/n8tz/CVE-2022-24999Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/01/msg00039.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230908-0005/
- https://github.com/expressjs/express/releases/tag/4.17.3Release Notes
- https://github.com/ljharb/qs/pull/428Issue Tracking, Patch
- https://github.com/n8tz/CVE-2022-24999Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/01/msg00039.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230908-0005/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.