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.
History

Tue, 11 Aug 2026 16:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:*:*:*:*:long-term_support:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p5:*:*:continuous_releases:*:*:*

Wed, 24 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 18 Jun 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared F5
F5 nginx Open Source
F5 nginx Plus
Vendors & Products F5
F5 nginx Open Source
F5 nginx Plus

Thu, 18 Jun 2026 04:45:00 +0000

Type Values Removed Values Added
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.
Title NGINX ngx_http_charset_module vulnerability
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L'}

cvssV4_0

{'score': 6.3, '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'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: f5

Published:

Updated: 2026-06-17T15:42:56.704Z

Reserved: 2026-06-02T21:45:04.856Z

Link: CVE-2026-48142

cve-icon Vulnrichment

Updated: 2026-06-17T15:42:53.164Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-17T15:16:59.040

Modified: 2026-08-11T15:03:44.877

Link: CVE-2026-48142

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-06-17T14:04:32Z

Links: CVE-2026-48142 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-18T19:45:15Z