# CVE-2026-101025: NGINX ngx_http_js_module vulnerability

CVE-2026-101025 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-101025, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-101025
- Priority: Routine
- CVSS: 5.3 (Moderate)
- EPSS: 0.0032
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 14, 2026
- Weakness: Missing Release of Memory after Effective Lifetime
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-101025

## Description

Description   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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libnginx-mod-js Debian 14 | 1.0.2-1 | [DEBIAN-CVE-2026-101025](https://patchblox.com/security/data/fix/linux/debian-cve-2026-101025.md) | Oct 24, 2026 |
| Linux | nginx-mod-njs amzn 2023 | 1.0.2-1.amzn2023.0.1 | [ALAS2023-2026-3300](https://patchblox.com/security/data/fix/linux/alas2023-2026-3300.md) | Nov 7, 2026 |
| Linux | nginx-mod-njs-debuginfo amzn 2023 | 1.0.2-1.amzn2023.0.1 | [ALAS2023-2026-3300](https://patchblox.com/security/data/fix/linux/alas2023-2026-3300.md) | Nov 7, 2026 |
| Linux | nginx-mod-njs-debugsource amzn 2023 | 1.0.2-1.amzn2023.0.1 | [ALAS2023-2026-3300](https://patchblox.com/security/data/fix/linux/alas2023-2026-3300.md) | Nov 7, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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