medium4.8
CVE-2026-48142
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| F5 | Dos | from 4.3.0 through 4.7.0 Version 4.9.0 |
| F5 | Nginx Gateway Fabric | from 1.3.0 through 1.6.2 from 2.0.0 through 2.6.3 |
| F5 | Nginx Ingress Controller | from 3.5.0 through 3.7.2 from 4.0.0 through 4.0.1 from 5.0.0 through 5.5.0 |
| F5 | Nginx Instance Manager | from 2.17.0 through 2.22.0 |
| F5 | Nginx Open Source | from 1.0.0 through 1.30.2 from 1.31.0 through 1.31.1 |
| F5 | Nginx Plus | from 37.0.0.1 before 37.0.2.1 from r33 before r36 Version r36 |
| F5 | Waf | from 4.10.0 through 4.16.0 from 5.2.0 through 5.8.0 from 5.9.0 through 5.13.1 |