Out-of-bounds Read in F5 Nginx Open Source
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;)…
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L.
Affected products
- F5 Nginx Open Source — versions 1.13.10, 1.30.0
- F5 Nginx Plus — versions 37.0, R36
Weakness classification (CWE)
References
- f5sirt@f5.com (vendor-advisory)
Frequently asked questions
- What is CVE-2026-48142?
- CVE-2026-48142 is a medium-severity vulnerability in F5 Nginx Open Source, classified under Out-of-bounds Read. CVSS score: 4.8/10. Published 2026-06-17.
- How severe is CVE-2026-48142?
- Medium severity. CVSS v3 base score is 4.8 out of 10.