CVE-2026-55957

EUVD-2026-40233

29.06.2026, 21:16

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.3 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Base Score

CVSS 3.x

EPSS Score

Percentile: 85.52%

Affected Products (NVD)

Vendor	Product	Version
apache	tomcat	𝑥 < 9.0.101
apache	tomcat	10.1.0 ≤ 𝑥 < 10.1.37
apache	tomcat	11.0.0 ≤ 𝑥 < 11.0.5

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

tomcat10

bookworm	10.1.55-1~deb12u1 fixed
bookworm (security)	10.1.55-1~deb12u1 fixed
forky	10.1.55-1 fixed
sid	10.1.55-1 fixed
trixie	10.1.55-1~deb13u1 fixed
trixie (security)	10.1.55-1~deb13u1 fixed

tomcat11

forky	11.0.24-1 fixed
sid	11.0.24-1 fixed
trixie	11.0.22-1~deb13u1 fixed
trixie (security)	11.0.22-1~deb13u1 fixed

tomcat9

bookworm	9.0.70-2 fixed
bullseye	vulnerable
bullseye (security)	9.0.118-0+deb11u1 fixed
forky	9.0.118-1 fixed
sid	9.0.118-1 fixed
trixie	9.0.95-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

tomcat6

jammy	dne
noble	dne
questing	dne
resolute	dne
trusty	needs-triage

tomcat7

bionic	not-affected
jammy	dne
noble	dne
questing	dne
resolute	dne
trusty	needs-triage

tomcat8

bionic	needs-triage
jammy	dne
noble	dne
questing	dne
resolute	dne
xenial	needs-triage

tomcat9

bionic	needs-triage
focal	needs-triage
jammy	needs-triage
noble	needs-triage
questing	ignored
resolute	needs-triage

tomcat10

jammy	dne
noble	needs-triage
questing	ignored
resolute	needs-triage

tomcat11

jammy	dne
noble	dne
questing	ignored
resolute	needs-triage

Amazon Linux Releases

Amazon Package

Release

tomcat10

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat10-admin-webapps

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat10-docs-webapp

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat10-el-5.0-api

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat10-jsp-3.1-api

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat10-lib

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat10-servlet-6.0-api

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat10-webapps

Amazon Linux 2023

1:10.1.39-1.amzn2023.0.1

fixed

tomcat9

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

tomcat9-admin-webapps

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

tomcat9-docs-webapp

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

tomcat9-el-3.0-api

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

tomcat9-jsp-2.3-api

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

tomcat9-lib

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

tomcat9-servlet-4.0-api

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

tomcat9-webapps

Amazon Linux 2023

1:9.0.102-1.amzn2023.0.1

fixed

Common Weakness Enumeration

CWE-304 - Missing Critical Step in Authentication
The software implements an authentication technique, but it skips a step that weakens the technique.

References

https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh

http://www.openwall.com/lists/oss-security/2026/06/29/26