Vulnerability Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their control) to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| F5 | Dos | >= 4.3.0, <= 4.7.0 |
| F5 | Nginx Gateway Fabric | >= 1.3.0, <= 1.6.2 |
| F5 | Nginx Ingress Controller | >= 3.5.0, <= 3.7.2 |
| F5 | Nginx Instance Manager | >= 2.17.0, <= 2.22.0 |
| F5 | Nginx Open Source | >= 1.0.0, <= 1.30.2 |
| F5 | Nginx Plus | >= 37.0.0.1, < 37.0.2.1 |
| F5 | Waf | >= 4.10.0, <= 4.16.0 |
Related Weaknesses (CWE)
References
- https://my.f5.com/manage/s/article/K000161585Vendor Advisory
FAQ
What is CVE-2026-48142?
CVE-2026-48142 is a vulnerability with a CVSS score of 4.8 (MEDIUM). NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is served or proxied through a location block with both source_charset utf-8; and a charset di...
How severe is CVE-2026-48142?
CVE-2026-48142 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48142?
Check the references section above for vendor advisories and patch information. Affected products include: F5 Dos, F5 Nginx Gateway Fabric, F5 Nginx Ingress Controller, F5 Nginx Instance Manager, F5 Nginx Open Source.