CVE-2026-89058

Name	CVE-2026-89058
Description	A flaw was found in RESTEasy's CorsFilter, which, when configured to allow all origins ("*"), reflects the request's Origin header back in the Access-Control-Allow-Origin response together with Access-Control-Allow-Credentials: true. This permissive cross-origin policy allows a malicious website to make credentialed cross-origin requests and read authenticated responses from a victim's session, resulting in a loss of confidentiality.
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
resteasy (PTS)	sid	3.6.2-4	vulnerable
resteasy3.0 (PTS)	forky, sid, bookworm, trixie	3.0.26-6	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
resteasy	source	(unstable)	(unfixed)
resteasy3.0	source	(unstable)	(unfixed)

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2519775
https://github.com/resteasy/resteasy/security/advisories/GHSA-972r-f3fv-whm3
https://redhat.atlassian.net/browse/RESTEASY-3796
Fixed by: https://github.com/resteasy/resteasy/commit/b31525814f77a0619f612440ff27111174dbfef8 (v7.0.5.Final)