CVE-2026-27654

Name	CVE-2026-27654
Description	NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker process or modification of source or destination file names outside the document root. This issue affects NGINX Open Source and NGINX Plus when the configuration file uses DAV module MOVE or COPY methods, prefix location (nonregular expression location configuration), and alias directives. The integrity impact is constrained because the NGINX worker process user has low privileges and does not have access to the entire system. 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+deb11u5	vulnerable
	bookworm	1.22.1-9+deb12u3	vulnerable
	bookworm (security)	1.22.1-9+deb12u4	vulnerable
	trixie (security), trixie	1.26.3-3+deb13u2	vulnerable
	forky, sid	1.28.3-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nginx	source	(unstable)	1.28.3-1

Notes

[trixie] - nginx <no-dsa> (Minor issue)
[bookworm] - nginx <no-dsa> (Minor issue)
https://my.f5.com/manage/s/article/K000160382
Fixed by: https://github.com/nginx/nginx/commit/a1d18284e0a173c4ef2b28425535d0f640ae0a82 (release-1.28.3)