Medium [CVE-2026-101025] Description NGINX JavaScript (njs) has a vulnerability where the built-in njs engine leaks a libxml2 parser context when xml.parse fails
This medium-severity F5 advisory covers CVE-2026-101025 affecting NGINX JavaScript.
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Summary
NGINX JavaScript (njs) has a vulnerability where the built-in njs engine leaks a libxml2 parser context when xml.parse() fails. The failure path did not register cleanup and the context was not released for the lifetime of the process.
An unauthenticated attacker may send requests with malformed XML and can cause unbounded memory growth in long-lived NGINX worker processes.
Impact
This vulnerability may allow remote attackers to send requests that trigger repeated parsing of malformed XML and may lead to NGINX worker termination or denial of service. There is no control plane exposure; this is a data plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- NGINX JavaScript 0.7.10 before 1.0.2
Official advisory · high-confidence parse· fetched 16 days ago·verify at source
Mitigation
Upgrade to a fixed release: 1.0.2. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 16 days ago·verify at source
More F5 advisories
- CVE-2026-101019Oct 14, 2026Description NGINX JavaScript (njs) has a vulnerability where the njs XML module exposes
- CVE-2026-78222Sep 2, 2026vulnerability exists in NGINX JavaScript where a malformed HTTP response received
- CVE-2026-78689Sep 2, 2026Description NGINX JavaScript (njs) has a vulnerability in the XML module's namespace
- CVE-2026-18329Sep 2, 2026Description NGINX JavaScript (njs) and QuickJS (qjs) engines have a vulnerability
- CVE-2026-104939Oct 14, 2026Description NGINX Ingress Controller has a vulnerability when implementing an externalAuth
- CVE-2026-95101Oct 14, 2026Description NGINX Plus and NGINX Open Source have a vulnerability
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