CVE-2026-48142

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.

• f5 dos (>= 4.3.0 <= 4.7.0) • f5 dos 4.9.0 • f5 nginx gateway fabric (>= 1.3.0 <= 1.6.2) • f5 nginx gateway fabric (>= 2.0.0 <= 2.6.3) • f5 nginx ingress controller (>= 3.5.0 <= 3.7.2) • f5 nginx ingress controller (>= 4.0.0 <= 4.0.1) • f5 nginx ingress controller (>= 5.0.0 <= 5.5.0) • f5 nginx instance manager (>= 2.17.0 <= 2.22.0) • f5 nginx open source (>= 1.0.0 <= 1.30.2) • f5 nginx open source (>= 1.31.0 <= 1.31.1) • f5 nginx plus (>= 37.0.0.1 < 37.0.2.1) • f5 nginx plus (>= r33 < r36) • f5 nginx plus r36 • f5 waf (>= 4.10.0 <= 4.16.0) • f5 waf (>= 5.2.0 <= 5.8.0) • f5 waf (>= 5.9.0 <= 5.13.1)