CVE-2026-48142
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.
How to fix
- f5 nginx_plus37.0.2.1, r36 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| f5 nginx_gateway_fabric | 1.3.0 ≤ v ≤ 1.6.2, 2.0.0 ≤ v ≤ 2.6.3 | — |
| f5 dos | 4.3.0 ≤ v ≤ 4.7.0, 4.9.0 | — |
| f5 nginx_ingress_controller | 3.5.0 ≤ v ≤ 3.7.2, 4.0.0 ≤ v ≤ 4.0.1, 5.0.0 ≤ v ≤ 5.5.0 | — |
| f5 nginx_instance_manager | 2.17.0 ≤ v ≤ 2.22.0 | — |
| f5 nginx_open_source | 1.0.0 ≤ v ≤ 1.30.2, 1.31.0 ≤ v ≤ 1.31.1 | — |
| f5 nginx_plus | 37.0.0.1 ≤ v < 37.0.2.1, r33 ≤ v < r36, r36 | 37.0.2.1, r36 |
| f5 waf | 4.10.0 ≤ v ≤ 4.16.0, 5.2.0 ≤ v ≤ 5.8.0, 5.9.0 ≤ v ≤ 5.13.1 | — |
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