CVE-2026-42934
Fixed in a distro release EPSS <1%CVSS 4.8
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.
Products: F5 NGINX Plus, F5 NGINX Open Source
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.21 | nginx | 1.26.3-r1 |
| Alpine 3.22 | nginx | 1.28.3-r1 |
| Alpine 3.23 | nginx | 1.28.3-r1 |
| Alpine 3.24 | nginx | 1.30.1-r0 |
| Chainguard | nginx-mainline | 1.31.0-r0 |
| Chainguard | nginx-stable | 1.30.1-r0 |
| Debian 12 | nginx | 1.22.1-9+deb12u7 |
| Debian 13 | nginx | 1.26.3-3+deb13u5 |
| Debian 14 | nginx | 1.30.0-4 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | nginx | 1.21.5-150400.3.20.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | nginx | 1.21.5-150400.3.20.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | nginx | 1.21.5-150400.3.20.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | nginx | 1.21.5-150400.3.20.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | nginx | 1.21.5-150400.3.20.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | nginx | 1.21.5-150400.3.20.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | nginx | 1.21.5-150400.3.20.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | nginx | 1.21.5-150400.3.20.1 |
| Ubuntu 22.04 LTS | nginx | 1.18.0-6ubuntu14.12 |
| Ubuntu 24.04 LTS | nginx | 1.24.0-2ubuntu7.9 |
| Ubuntu 25.10 | nginx | 1.28.0-6ubuntu1.4 |
| Ubuntu 26.04 LTS | nginx | 1.28.3-2ubuntu1.2 |
| Ubuntu Pro 14.04 LTS | nginx | 1.4.6-1ubuntu3.9+esm6 |
| Ubuntu Pro 16.04 LTS | nginx | 1.10.3-0ubuntu0.16.04.5+esm7 |
| Ubuntu Pro 18.04 LTS | nginx | 1.14.0-0ubuntu1.11+esm2 |
| Ubuntu Pro 20.04 LTS | nginx | 1.18.0-0ubuntu1.7+esm1 |
| Wolfi | nginx-mainline | 1.31.0-r0 |
| Wolfi | nginx-stable | 1.30.1-r0 |
| openSUSE Tumbleweed | nginx | 1.31.0-1.1 |