CVE-2026-48142

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nginx (PTS)	bullseye	1.18.0-6.1+deb11u3	vulnerable
	bullseye (security)	1.18.0-6.1+deb11u7	vulnerable
	bookworm	1.22.1-9+deb12u6	vulnerable
	bookworm (security)	1.22.1-9+deb12u8	vulnerable
	trixie	1.26.3-3+deb13u4	vulnerable
	trixie (security)	1.26.3-3+deb13u6	vulnerable
	forky, sid	1.30.1-4	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nginx	source	(unstable)	(unfixed)

Notes

https://my.f5.com/manage/s/article/K000161585
https://github.com/nginx/nginx/commit/319a0bff157b15d9061f4712b2edbe6fdd2dee66 (release-1.31.2)
https://github.com/nginx/nginx/commit/60c4243eb8775d51662a01def8a7dad5d9fb34a7 (release-1.30.3)