Improper Handling of Case Sensitivity in xmldom - CVE-2026-83612
Published: August 25, 2026 / Updated: September 2, 2026
Vulnerability identifier: #VU145139
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-2026-83612
CWE-ID: CWE-178
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 improper handling of case sensitivity in the HTML raw-text parser when parsing untrusted HTML in HTML mode with mixed-case closing tags for raw-text elements. A remote attacker can send a specially crafted HTML document to cause a denial of service.
Only HTML mode is affected, and exploitation requires the application to parse and serialize untrusted text/html containing mixed-case closing tags for script, style, textarea, or title elements.
Affected software
xmldom
How to mitigate CVE-2026-83612
Install security update from vendor's website.
xmldom - update to 0.9.12