Memory leak in NGINX JavaScript - CVE-2026-101025
Published: October 14, 2026
Vulnerability identifier: #VU155762
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-2026-101025
CWE-ID: CWE-401
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 failure to release a libxml2 parser context in the built-in njs engine's xml.parse() function within ngx_http_js_module when parsing malformed XML fails. A remote attacker can send requests that repeatedly trigger parsing of malformed XML to cause a denial of service.
This issue is limited to the data plane; there is no control plane exposure.
Affected software
NGINX JavaScript
How to mitigate CVE-2026-101025
Install security update from vendor's website.
NGINX JavaScript - update to 1.0.2