Skip to content
Fencer Vulns
critical 9.1

CVE-2026-55276 json

Apache Tomcat: Logged effective web.xml is incomplete

published 2026-06-29 4 mo ago modified 2026-11-04 4 d ago also BIT-tomcat-2026-55276 , EUVD-2026-40230 , GHSA-mqg3-r7h5-24x4

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.

Patch / fix

  • maven org.apache.tomcat.embed:tomcat-embed-core 9.0.119, 10.1.56, 11.0.23
  • maven org.apache.tomcat:tomcat 9.0.119, 10.1.56, 11.0.23
  • maven org.apache.tomcat:tomcat-util-scan 9.0.119, 10.1.56, 11.0.23
  • bitnami tomcat 9.0.119, 10.1.56, 11.0.23
  • apache tomcat 9.0.119, 10.1.56, 11.0.23
  • org.apache.tomcat tomcat 9.0.119, 10.1.56, 11.0.23
  • apache tomcat-catalina 9.0.119, 10.1.56, 11.0.23
  • org.apache.tomcat tomcat-catalina 9.0.119, 10.1.56, 11.0.23
  • apache tomcat-embed-core 9.0.119, 10.1.56, 11.0.23
  • org.apache.tomcat.embed tomcat-embed-core 9.0.119, 10.1.56, 11.0.23
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.70-2
  • tomcat10 Debian 14 10.1.60-1
  • tomcat11 Debian 14 11.0.24-1

debian advisories DEBIAN-CVE-2026-55276

  • tomcat8 Ubuntu Pro 16.04 LTS 8.0.32-1ubuntu1.13+esm2
  • tomcat8 Ubuntu Pro 18.04 LTS 8.5.39-1ubuntu1~18.04.3+esm6

ubuntu advisories UBUNTU-CVE-2026-55276

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jws6-tomcat jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el10jws
  • jws6-tomcat jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el8jws
  • jws6-tomcat jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el9jws
  • jws6-tomcat-lib jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el10jws
  • jws6-tomcat-lib jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el8jws
  • jws6-tomcat-lib jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el9jws
  • jws6-tomcat-javadoc jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el10jws
  • jws6-tomcat-javadoc jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el8jws

red hat advisories RHSA-2026:73981RHSA-2026:68651RHSA-2026:68680RHSA-2026:68679RHSA-2026:68677RHSA-2026:68678

  • tomcat10 SLE Module for Web and Scripting 15 SP7 10.1.56-150200.5.70.1
  • tomcat SLE Module for Web and Scripting 15 SP7 9.0.119-150200.111.1
  • tomcat11 SLE Module for Web and Scripting 15 SP7 11.0.23-150600.13.24.1
  • tomcat10 SLES for SAP applications 16.0, SLES 16.0 10.1.56-160000.1.1
  • tomcat SLES for SAP applications 16.0, SLES 16.0 9.0.119-160000.1.1
  • tomcat11 SLES for SAP applications 16.0, SLES 16.0 11.0.23-160000.1.1
  • tomcat SLES LTSS Extended Security 12 SP5 9.0.119-3.169.1

suse advisories SUSE-SU-2026:3167-1SUSE-SU-2026:3112-1SUSE-SU-2026:3088-1SUSE-SU-2026:3087-1SUSE-SU-2026:22647-1SUSE-SU-2026:22646-1

  • tomcat openSUSE Leap 16.0 9.0.119-160000.1.1
  • tomcat10 openSUSE Leap 16.0 10.1.56-160000.1.1
  • tomcat11 openSUSE Leap 16.0 11.0.23-160000.1.1
  • tomcat openSUSE Tumbleweed 9.0.119-1.1
  • tomcat10 openSUSE Tumbleweed 10.1.56-1.1
  • tomcat11 openSUSE Tumbleweed 11.0.23-1.1

opensuse advisories openSUSE-SU-2026:21327-1openSUSE-SU-2026:21328-1openSUSE-SU-2026:21329-1openSUSE-SU-2026:11208-1openSUSE-SU-2026:11209-1openSUSE-SU-2026:11195-1

  • tomcat9 AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-lib AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-webapps AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-el-3.0-api AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-docs-webapp AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-jsp-2.3-api AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-admin-webapps AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-servlet-4.0-api AlmaLinux 10 1:9.0.120-1.el10_2.alma.1

almalinux advisories ALSA-2026:68651ALSA-2026:68660ALSA-2026:68677

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-55276 updated cvss 2.3

tomcat: Apache Tomcat: Misleading security logs due to incorrect control flow

  • Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more Red Hat Enterprise Linux 8 pki-servlet-engine, pki-servlet-4.0-api Red Hat Enterprise Linux 9 pki-servlet-engine, pki-servlet-4.0-api Red Hat Enterprise Linux 10 tomcat Red Hat JBoss Web Server 5 jws5-tomcat, jws5-tomcat-lib, jws5-tomcat-jsvc, jws5-tomcat-javadoc, jws5-tomcat-selinux, jws5-tomcat-webapps, +7 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) tomcat 9.0.120-1.el8_10, tomcat-lib 9.0.120-1.el8_10, tomcat-webapps 9.0.120-1.el8_10, tomcat-el-3.0-api 9.0.120-1.el8_10, tomcat-docs-webapp 9.0.120-1.el8_10, tomcat-jsp-2.3-api 9.0.120-1.el8_10, +2 more
    fixed: vendor fix RHSA-2026:68677
  • Red Hat Enterprise Linux AppStream (v. 9) tomcat 9.0.120-2.el9_8, tomcat-lib 9.0.120-2.el9_8, tomcat-webapps 9.0.120-2.el9_8, tomcat-el-3.0-api 9.0.120-2.el9_8, tomcat-docs-webapp 9.0.120-2.el9_8, tomcat-jsp-2.3-api 9.0.120-2.el9_8, +2 more
    fixed: vendor fix RHSA-2026:68660
  • Red Hat Enterprise Linux AppStream (v. 10) tomcat9 9.0.120-1.el10_2, tomcat9-lib 9.0.120-1.el10_2, tomcat9-webapps 9.0.120-1.el10_2, tomcat9-el-3.0-api 9.0.120-1.el10_2, tomcat9-docs-webapp 9.0.120-1.el10_2, tomcat9-jsp-2.3-api 9.0.120-1.el10_2, +2 more
    fixed: vendor fix RHSA-2026:68651
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) tomcat 9.0.120-1.el8_8, tomcat-lib 9.0.120-1.el8_8, tomcat-webapps 9.0.120-1.el8_8, tomcat-el-3.0-api 9.0.120-1.el8_8, tomcat-docs-webapp 9.0.120-1.el8_8, tomcat-jsp-2.3-api 9.0.120-1.el8_8, +2 more
    fixed: vendor fix RHSA-2026:68680
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat 9.0.120-1.el9_2, tomcat-lib 9.0.120-1.el9_2, tomcat-webapps 9.0.120-1.el9_2, tomcat-el-3.0-api 9.0.120-1.el9_2, tomcat-docs-webapp 9.0.120-1.el9_2, tomcat-jsp-2.3-api 9.0.120-1.el9_2, +2 more
    fixed: vendor fix RHSA-2026:68678
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) tomcat 9.0.120-1.el9_4, tomcat-lib 9.0.120-1.el9_4, tomcat-webapps 9.0.120-1.el9_4, tomcat-el-3.0-api 9.0.120-1.el9_4, tomcat-docs-webapp 9.0.120-1.el9_4, tomcat-jsp-2.3-api 9.0.120-1.el9_4, +2 more
    fixed: vendor fix RHSA-2026:68679
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tomcat9 9.0.120-1.el10_0, tomcat9-lib 9.0.120-1.el10_0, tomcat9-webapps 9.0.120-1.el10_0, tomcat9-el-3.0-api 9.0.120-1.el10_0, tomcat9-docs-webapp 9.0.120-1.el10_0, tomcat9-jsp-2.3-api 9.0.120-1.el10_0, +2 more
    fixed: vendor fix RHSA-2026:67163
show 7 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) tomcat 9.0.120-1.el9_6, tomcat-lib 9.0.120-1.el9_6, tomcat-webapps 9.0.120-1.el9_6, tomcat-el-3.0-api 9.0.120-1.el9_6, tomcat-docs-webapp 9.0.120-1.el9_6, tomcat-jsp-2.3-api 9.0.120-1.el9_6, +2 more
    fixed: vendor fix RHSA-2026:68659
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) tomcat 9.0.120-1.el8_8, tomcat-lib 9.0.120-1.el8_8, tomcat-webapps 9.0.120-1.el8_8, tomcat-el-3.0-api 9.0.120-1.el8_8, tomcat-docs-webapp 9.0.120-1.el8_8, tomcat-jsp-2.3-api 9.0.120-1.el8_8, +2 more
    fixed: vendor fix RHSA-2026:68680
  • Red Hat Hardened Images tomcat10 10.1.56-1.hum1, tomcat11 11.0.23-0.1.hum1, tomcat10-lib 10.1.56-1.hum1, tomcat11-lib 11.0.23-0.1.hum1, tomcat10-common 10.1.56-1.hum1, tomcat10-webapps 10.1.56-1.hum1, +14 more
    fixed: vendor fix RHSA-2026:29203
  • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-lib 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-javadoc 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-selinux 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-webapps 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-el-5.0-api 10.1.49-16.redhat_00016.1.el8jws, +4 more Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-lib 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-javadoc 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-selinux 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-webapps 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-el-5.0-api 10.1.49-16.redhat_00016.1.el9jws, +4 more Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-lib 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-javadoc 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-selinux 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-webapps 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-el-5.0-api 10.1.49-16.redhat_00016.1.el10jws, +4 more
    fixed: vendor fix RHSA-2026:73981
  • Red Hat JBoss Web Server 6.2.5
    fixed: vendor fix RHSA-2026:73982
  • Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-lib 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-javadoc 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-selinux 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-webapps 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-el-5.0-api 11.0.21-6.redhat_00005.1.el8jws, +4 more Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-lib 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-javadoc 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-selinux 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-webapps 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-el-5.0-api 11.0.21-6.redhat_00005.1.el9jws, +4 more Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-lib 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-javadoc 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-selinux 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-webapps 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-el-5.0-api 11.0.21-6.redhat_00005.1.el10jws, +4 more
    fixed: vendor fix RHSA-2026:49951
  • Red Hat JBoss Web Server 7.0.1
    fixed: vendor fix RHSA-2026:49952

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat.embed:tomcat-embed-core
>=11.0.0-M1, <11.0.23
>=10.1.0-M1, <10.1.56
>=9.0.0.M1, <9.0.119
>=8.5.0, <=8.5.100
11.0.23
10.1.56
9.0.119
maven org.apache.tomcat:tomcat
>=11.0.0-M1, <11.0.23
>=10.1.0-M1, <10.1.56
>=9.0.0.M1, <9.0.119
>=8.5.0, <=8.5.100
11.0.23
10.1.56
9.0.119
maven org.apache.tomcat:tomcat-util-scan
>=11.0.0-M1, <11.0.23
>=10.1.0-M1, <10.1.56
>=9.0.0.M1, <9.0.119
>=8.5.0, <=8.5.100
11.0.23
10.1.56
9.0.119
bitnami tomcat
<9.0.119
>=10.0.0, <10.1.56
>=11.0.0, <11.0.23
9.0.119
10.1.56
11.0.23

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness
  • CWE-670 Always-Incorrect Control Flow Implementation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.