# CVE-2026-78222: NGINX ngx_http_js_module vulnerability

CVE-2026-78222 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-78222, released September 10, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-78222
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0062
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 2, 2026
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78222

## Description

A vulnerability exists in NGINX JavaScript where a malformed HTTP response received by ngx.fetch() can crash an NGINX worker when trusted JavaScript reads Response.statusText. Exploitation requires control or influence over the fetched HTTP response.  Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system. 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 | 1.0.1-1 | [DEBIAN-CVE-2026-78222](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78222.md) | Sep 10, 2026 |
| Linux | nginx-mod-njs amzn 2023 | 1.0.1-1.amzn2023.0.1 | [ALAS2023-2026-3095](https://patchblox.com/security/data/fix/linux/alas2023-2026-3095.md) | Sep 28, 2026 |
| Linux | nginx-mod-njs-debuginfo amzn 2023 | 1.0.1-1.amzn2023.0.1 | [ALAS2023-2026-3095](https://patchblox.com/security/data/fix/linux/alas2023-2026-3095.md) | Sep 28, 2026 |
| Linux | nginx-mod-njs-debugsource amzn 2023 | 1.0.1-1.amzn2023.0.1 | [ALAS2023-2026-3095](https://patchblox.com/security/data/fix/linux/alas2023-2026-3095.md) | Sep 28, 2026 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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