Uncaught Exception in qs - CVE-2026-82417
Published: September 2, 2026
Vulnerability identifier: #VU146786
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-82417
CWE-ID: CWE-248
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an uncaught exception in utils.isBuffer in qs.stringify when processing parsed query string data during a parse-to-stringify round-trip. A remote attacker can send a specially crafted query string to cause a denial of service.
The issue is reachable when qs.parse preserves constructor and isBuffer as own properties, such as with plainObjects: true or allowPrototypes: true.
Affected software
qs
PowerVC
Fedora
IBM DataPower Gateway
nextcloud
PowerVC
Fedora
IBM DataPower Gateway
nextcloud
How to mitigate CVE-2026-82417
Install security update from vendor's website.
qs - update to 6.16.0
IBM DataPower Gateway - addressed in versions 10.5.0.23, 10.6.0.11, 11.0.0.3
nextcloud - addressed in versions 34.0.4-1.el10_2, 34.0.4-1.el10_4, 34.0.4-1.fc43, 34.0.4-1.fc44, 34.0.4-1.fc45
IBM DataPower Gateway - addressed in versions 10.5.0.23, 10.6.0.11, 11.0.0.3
nextcloud - addressed in versions 34.0.4-1.el10_2, 34.0.4-1.el10_4, 34.0.4-1.fc43, 34.0.4-1.fc44, 34.0.4-1.fc45