CVE-2026-28755

Name	CVE-2026-28755
Description	NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked. 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)	1.28.3-2

Notes

[trixie] - nginx <no-dsa> (Minor issue)
[bookworm] - nginx <no-dsa> (Minor issue)
https://my.f5.com/manage/s/article/K000160368
Fixed by: https://github.com/nginx/nginx/commit/78f581487706f2e43eea5a060c516fc4d98090e8 (release-1.28.3)