CVE-2026-75973

Name	CVE-2026-75973
Description	Improper Authentication vulnerability in Apache Tomcat. When Jakarta Authentication was configured with SimpleAuthConfigProvider as the default provider and multiple web application used that provider, the realm for the first web application to authenticate a request would be used for all web applications. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M4 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fixes the issue.
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)
Debian Bugs	1148824

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
tomcat10 (PTS)	bookworm, bookworm (security)	10.1.55-1~deb12u1	vulnerable
	trixie (security), trixie	10.1.55-1~deb13u1	vulnerable
	forky, sid	10.1.60-1	fixed
tomcat11 (PTS)	trixie (security), trixie	11.0.22-1~deb13u1	vulnerable
	forky, sid	11.0.24-1	vulnerable
tomcat9 (PTS)	bookworm	9.0.70-2	fixed
	trixie	9.0.95-1	fixed
	forky, sid	9.0.122-1	fixed

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

Package	Type	Release	Fixed Version	Debian Bugs
tomcat10	source	(unstable)	10.1.60-1
tomcat11	source	(unstable)	(unfixed)	1148824
tomcat9	source	(unstable)	9.0.70-2

Notes

Starting with 9.0.70-2 src:tomcat9 no longer ships the server stack, using that as the fixed version
https://github.com/apache/tomcat/commit/2585fc798f24f0b8811fd20ad9b4e8affb6f69a6 (11.0.26)
https://github.com/apache/tomcat/commit/f62c65768fdaa300e22e64ffa7b5118dce0571a1 (10.1.60)
https://github.com/apache/tomcat/commit/043115414a39127cad015e9d285296e59c18bb41 (9.0.122)