medium4.8
CVE-2026-42934
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 charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' 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 4.8.0 |
| F5 | Nginx Gateway Fabric | from 1.3.0 through 1.6.2 from 2.0.0 through 2.6.0 |
| 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 5.4.2 |
| F5 | Nginx Instance Manager | from 2.16.0 through 2.22.0 |
| F5 | Nginx Open Source | from 0.3.50 through 0.9.7 from 1.0.0 through 1.30.0 |
| F5 | Nginx Plus | from r32 through r36 |
| F5 | Waf | from 4.9.0 through 4.16.0 from 5.1.0 through 5.8.0 from 5.9.0 through 5.12.1 |