CVE-2026-42934

Name	CVE-2026-42934
Description	NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' 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)
References	DSA-6278-1

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+deb11u5	vulnerable
	bookworm	1.22.1-9+deb12u6	vulnerable
	bookworm (security)	1.22.1-9+deb12u7	fixed
	trixie	1.26.3-3+deb13u4	vulnerable
	trixie (security)	1.26.3-3+deb13u5	fixed
	forky	1.30.0-2	vulnerable
	sid	1.30.0-4	fixed

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

Package	Type	Release	Fixed Version	Origin
nginx	source	bookworm	1.22.1-9+deb12u7	DSA-6278-1
nginx	source	trixie	1.26.3-3+deb13u5	DSA-6278-1
nginx	source	(unstable)	1.30.0-4

Notes

https://my.f5.com/manage/s/article/K000161028
https://nginx.org/en/security_advisories.html
https://github.com/nginx/nginx/commit/54b7945961b2eaafc480d6b85d9635d0db1c126a (release-1.30.1)