CVE-2026-55955
tomcat11: Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in t...
CVE-2026-55955 is fixed in 25 products on 1 platform, first by RHSA-2026:67163, released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
6.5
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0044
38th percentile
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| tomcat · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat · opensuse-leap 16.0 | 9.0.119-160000.1.1 | OPENSUSE-SU-2026:21327-1 | Jul 13, 2026 |
| tomcat · sles 15.7 | 9.0.119-150200.111.1 | SUSE-SU-2026:3088-1 | Jul 16, 2026 |
| tomcat · sles 16.0 | 9.0.119-160000.1.1 | SUSE-SU-2026:22646-1 | Jul 13, 2026 |
| tomcat-admin-webapps · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat-admin-webapps · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat-admin-webapps · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat-admin-webapps · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat-docs-webapp · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat-docs-webapp · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat-docs-webapp · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat-docs-webapp · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat-el-3.0-api · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat-el-3.0-api · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat-el-3.0-api · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat-el-3.0-api · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat-jsp-2.3-api · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat-jsp-2.3-api · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat-jsp-2.3-api · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat-jsp-2.3-api · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat-lib · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat-lib · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat-lib · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat-lib · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat-servlet-4.0-api · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat-servlet-4.0-api · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat-servlet-4.0-api · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat-servlet-4.0-api · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat-webapps · RHEL 8 | 1:9.0.120-1.el8_10 | RHSA-2026:68677 | Sep 19, 2026 |
| tomcat-webapps · RHEL 9 | 1:9.0.120-2.el9_8 | RHSA-2026:68660 | Sep 19, 2026 |
| tomcat-webapps · almalinux 8 | 1:9.0.120-1.el8_10 | ALSA-2026:68677 | Sep 17, 2026 |
| tomcat-webapps · almalinux 9 | 1:9.0.120-2.el9_8 | ALSA-2026:68660 | Sep 17, 2026 |
| tomcat10 · Debian 14 | 10.1.60-1 | DEBIAN-CVE-2026-55955 | Jun 30, 2026 |
| tomcat10 · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat10 · opensuse-leap 16.0 | 10.1.56-160000.1.1 | OPENSUSE-SU-2026:21328-1 | Jul 13, 2026 |
| tomcat10 · sles 15.7 | 10.1.56-150200.5.70.1 | SUSE-SU-2026:3112-1 | Jul 17, 2026 |
| tomcat10 · sles 16.0 | 10.1.56-160000.1.1 | SUSE-SU-2026:22647-1 | Jul 13, 2026 |
| tomcat10-admin-webapps · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat10-docs-webapp · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat10-el-5.0-api · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat10-jsp-3.1-api · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat10-lib · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat10-servlet-6.0-api · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat10-webapps · amzn 2023 | 1:10.1.57-1.amzn2023.0.1 | ALAS2023-2026-1946 | Jul 20, 2026 |
| tomcat11 · Debian 14 | 11.0.24-1 | DEBIAN-CVE-2026-55955 | Jun 30, 2026 |
| tomcat11 · opensuse-leap 16.0 | 11.0.23-160000.1.1 | OPENSUSE-SU-2026:21329-1 | Jul 13, 2026 |
| tomcat11 · sles 15.7 | 11.0.23-150600.13.24.1 | SUSE-SU-2026:3087-1 | Jul 16, 2026 |
| tomcat11 · sles 16.0 | 11.0.23-160000.1.1 | SUSE-SU-2026:22648-1 | Jul 13, 2026 |
| tomcat9 · Debian 12.15 (bookworm) | 9.0.70-2 | DEBIAN-CVE-2026-55955 | Jun 30, 2026 |
| tomcat9 · Debian 13.5 (trixie) | 9.0.70-2 | DEBIAN-CVE-2026-55955 | Jun 30, 2026 |
| tomcat9 · Debian 14 | 9.0.70-2 | DEBIAN-CVE-2026-55955 | Jun 30, 2026 |
| tomcat9 · RHEL 10 | 9.0.120-1.el10_0 | RHSA-2026:67163 | May 27, 2026 |
| tomcat9 · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9 · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
| tomcat9-admin-webapps · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9-admin-webapps · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
| tomcat9-docs-webapp · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9-docs-webapp · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
| tomcat9-el-3.0-api · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9-el-3.0-api · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
| tomcat9-jsp-2.3-api · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9-jsp-2.3-api · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
| tomcat9-lib · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9-lib · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
| tomcat9-servlet-4.0-api · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9-servlet-4.0-api · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
| tomcat9-webapps · almalinux 10 | 1:9.0.120-1.el10_2.alma.1 | ALSA-2026:68651 | Sep 17, 2026 |
| tomcat9-webapps · amzn 2023 | 1:9.0.120-1.amzn2023.0.1 | ALAS2023-2026-1945 | Jul 20, 2026 |
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