CVE-2026-42946

Name	CVE-2026-42946
Description	A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it. 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	DLA-4589-1, DSA-6326-1

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+deb11u8	fixed
	bookworm, bookworm (security)	1.22.1-9+deb12u9	fixed
	trixie (security), trixie	1.26.3-3+deb13u7	fixed
	forky, sid	1.30.1-6	fixed

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

Package	Type	Release	Fixed Version	Origin
nginx	source	bullseye	1.18.0-6.1+deb11u6	DLA-4589-1
nginx	source	bookworm	1.22.1-9+deb12u8	DSA-6326-1
nginx	source	trixie	1.26.3-3+deb13u6	DSA-6326-1
nginx	source	(unstable)	1.30.0-4

Notes

https://my.f5.com/manage/s/article/K000161027
https://nginx.org/en/security_advisories.html
https://github.com/nginx/nginx/commit/baef7fdac28e4e1fe26509b50b8d15603393e28e (release-1.30.1)
https://github.com/nginx/nginx/commit/39d7d0ba0799fcff6baee52b6525f45739593cfd (release-1.30.1)