tomcat9: Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP req...
CVE-2026-78383 is fixed in 30 products on 1 platform, first by RHSA-2026:93618, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.
Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service. 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.M1 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, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jws7-mod_cluster · RHEL 10 | 2.1.1-1.Final_redhat_00001.1.el10jws | RHSA-2026:93618 | Sep 23, 2026 |
| jws7-tomcat · RHEL 10 | 11.0.21-10.redhat_00010.1.el10jws | RHSA-2026:93618 | Sep 23, 2026 |
| jws7-tomcat-native · RHEL 10 | 1.3.7-4.redhat_4.el10jws | RHSA-2026:93618 | Sep 23, 2026 |
| libtcnative-1-0 · opensuse-leap 16.0 | 1.3.9-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| libtcnative-1-0 · sles 15.6 | 1.3.9-150600.16.9.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| libtcnative-1-0 · sles 15.7 | 1.3.9-150600.16.9.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| libtcnative-1-0 · sles 16.0 | 1.3.9-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| libtcnative-2-0 · opensuse-leap 16.0 | 2.0.16-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| libtcnative-2-0 · sles 16.0 | 2.0.16-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat · opensuse-leap 16.0 | 9.0.122-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| tomcat · sles 15.6 | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat · sles 15.7 | 9.0.122-150200.123.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat · sles 16.0 | 9.0.122-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat10 · Debian 14 | 10.1.60-1 | DEBIAN-CVE-2026-78383 | Sep 24, 2026 |
| tomcat10 · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10 · opensuse-leap 16.0 | 10.1.60-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| tomcat10 · sles 15.6 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat10 · sles 15.7 | 10.1.60-150200.5.82.2 | SUSE-SU-2026:4546-1 | Oct 6, 2026 |
| tomcat10 · sles 16.0 | 10.1.60-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat10-admin-webapps · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-docs-webapp · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-el-5.0-api · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-jsp-3.1-api · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-lib · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-servlet-6.0-api · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat10-webapps · amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | ALAS2023-2026-3165 | Nov 7, 2026 |
| tomcat11 · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11 · opensuse-leap 16.0 | 11.0.26-160000.1.1 | OPENSUSE-SU-2026:21984-1 | Sep 30, 2026 |
| tomcat11 · sles 15.6 | 11.0.26-150600.13.36.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| tomcat11 · sles 15.7 | 11.0.26-150600.13.36.2 | SUSE-SU-2026:4544-1 | Oct 6, 2026 |
| tomcat11 · sles 16.0 | 11.0.26-160000.1.1 | SUSE-SU-2026:23985-1 | Sep 30, 2026 |
| tomcat11-admin-webapps · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-docs-webapp · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-el-6.0-api · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-jsp-4.0-api · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-lib · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-servlet-6.1-api · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat11-webapps · amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | ALAS2023-2026-3151 | Nov 7, 2026 |
| tomcat9 · Debian 12.15 (bookworm) | 9.0.70-2 | DEBIAN-CVE-2026-78383 | Sep 24, 2026 |
| tomcat9 · Debian 13.5 (trixie) | 9.0.70-2 | DEBIAN-CVE-2026-78383 | Sep 24, 2026 |
| tomcat9 · Debian 14 | 9.0.70-2 | DEBIAN-CVE-2026-78383 | Sep 24, 2026 |
| tomcat9 · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-admin-webapps · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-docs-webapp · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-el-3.0-api · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-jsp-2.3-api · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-lib · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-servlet-4.0-api · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
| tomcat9-webapps · amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | ALAS2023-2026-3166 | Nov 7, 2026 |
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