Input validation error in qs - CVE-2026-2391
Published: March 13, 2026
Vulnerability identifier: #VU123997
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-2391
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: npm Inc.
Affected software:
qs
qs
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due the arrayLimit option in qs does not enforce limits for comma-separated values when comma: true is enabled. A remote attacker can pass overly large string to the application and consume all available memory resources, leading to a denial of service condition.
How to mitigate CVE-2026-2391
Install updates from vendor's website.