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.
CVSS Details
- CVSS 4.0 Base Score: 6.3 (MEDIUM)
- CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
- CVSS 3.1 Base Score: 4.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade nginx | Jun 23, 2026 | Jun 17, 2026 |
| Amazon Linux Ami 2 | — | Upgrade nginx-mod-http-xslt-filterUpgrade nginx-mod-http-image-filterUpgrade nginx-mod-http-geoipUpgrade nginx-coreUpgrade nginxUpgrade nginx-mod-http-perlUpgrade nginx-all-modulesUpgrade nginx-mod-streamUpgrade nginx-filesystemUpgrade nginx-mod-develUpgrade nginx-debuginfoUpgrade nginx-mod-mail | Jul 8, 2026 | Jul 8, 2026 |
| Amazon_linux_2023 | — | Upgrade nginx-filesystemUpgrade nginx-mod-http-image-filterUpgrade nginx-mod-http-perlUpgrade nginx-mod-streamUpgrade nginx-core-debuginfoUpgrade nginx-debuginfoUpgrade nginxUpgrade nginx-mod-http-perl-debuginfoUpgrade nginx-mod-develUpgrade nginx-debugsourceUpgrade nginx-coreUpgrade nginx-mod-stream-debuginfoUpgrade nginx-mod-http-xslt-filter-debuginfoUpgrade nginx-mod-http-image-filter-debuginfoUpgrade nginx-all-modulesUpgrade nginx-mod-mailUpgrade nginx-mod-http-xslt-filterUpgrade nginx-mod-mail-debuginfo | Jul 8, 2026 | Jun 17, 2026 |
| Debian | — | Upgrade nginx | Jul 1, 2026 | Jul 1, 2026 |
| Freebsd | — | Upgrade nginx-develUpgrade nginx | Jun 18, 2026 | Jun 17, 2026 |
| Gentoo Linux | — | Upgrade www-servers/nginx. | Aug 17, 2026 | Aug 17, 2026 |
| Nginx | — | Upgrade to nginx version 1.30.3Upgrade to nginx version 1.31.2 | Jun 18, 2026 | Jun 17, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Jun 17, 2026 |
| Ubuntu | — | Upgrade nginx-fullUpgrade nginx-extrasUpgrade nginxUpgrade nginx-lightUpgrade nginx-core | Jun 22, 2026 | Jun 19, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 13, 2026 | Jun 17, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub