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[USN-8425-1] njs vulnerability

Posted on 17 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8425-1
June 11, 2026

libnginx-mod-js vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS

Summary:

njs could be made to crash or run programs if it received a specially
crafted input.

Software Description:
- libnginx-mod-js: A subset of JavaScript language to use in nginx

Details:

It was discovered that njs did not properly handle certain client-
controlled variables when processing ngx.fetch() requests. An attacker
could possibly use this issue to trigger a heap buffer overflow, resulting
in arbitrary code execution or a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libnginx-mod-http-js 0.9.4-1ubuntu0.1~esm1
Available with Ubuntu Pro
libnginx-mod-stream-js 0.9.4-1ubuntu0.1~esm1
Available with Ubuntu Pro
njs 0.9.4-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8425-1
CVE-2026-8711

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