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 CVE-2026-48142

To remediate CVE-2026-48142, upgrade the affected package to a fixed version below.

• —upgrade to 1.26.3-r2 or later
• —upgrade to 1.30.3 or later
• —upgrade to 2.6.4 or later

Is CVE-2026-48142 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 1.26.3-r2
• >= 0.3.50, < 1.30.3, >= 1.31.0, < 1.31.2
• >= 1.3.0, < 2.6.4

CVSS scores

References (3)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2026-48142
• WEBmy.f5.com/manage/s/article/K000161585
• WEBnvd.nist.gov/vuln/detail/CVE-2026-48142