Inefficient regular expression complexity in xmldom - CVE-2026-83619
Published: August 25, 2026 / Updated: September 2, 2026
Vulnerability identifier: #VU145135
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83619
CWE-ID: CWE-1333
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 inefficient regular expression complexity in the end-tag parser in lib/sax.js when parsing an XML end tag whose name is followed by a long run of whitespace and then a non-whitespace character via DOMParser.parseFromString. A remote attacker can send a specially crafted XML document to cause a denial of service.
The issue is reachable under default options before any validity check and can stall the Node.js event loop during a single parse.
Affected software
xmldom
IBM DataPower Gateway
IBM DataPower Gateway
How to mitigate CVE-2026-83619
Install security update from vendor's website.
xmldom - update to 0.8.15
IBM DataPower Gateway - addressed in versions 10.5.0.23, 10.6.0.11, 11.0.0.3
IBM DataPower Gateway - addressed in versions 10.5.0.23, 10.6.0.11, 11.0.0.3