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Ubuntu 26.04 LTS njs Critical Heap Overflow Risk USN-8425-1

ubuntu
Calendar Grey June 17, 2026
Dist Ubuntu Esm H88
A critical flaw in njs may lead to denial of service or arbitrary code execution on Ubuntu 26.04 LTS. Update recommended.
njs could be made to crash or run programs if it received a specially crafted input.

Summary

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.

Topics%20covered

Topics Covered

security advisory critical arbitrary code execution Ubuntu heap overflow njs

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8425-1

Topics%20covered

Topics Covered

security advisory critical arbitrary code execution Ubuntu heap overflow njs

Package Information

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