NULL pointer dereference in fast-xml-parser - CVE-2026-26278
Published: February 23, 2026
Vulnerability identifier: #VU123126
CSH Severity: Medium
CVSS v4.0: 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/E:P/U:Green
CVE-ID: CVE-2026-26278
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: Natural Intelligence
Affected software:
fast-xml-parser
fast-xml-parser
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the replaceEntitiesValue() function in OrderedObjParser.js. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
How to mitigate CVE-2026-26278
Install updates from vendor's website.