# CVE-2026-78437: tomcat9: Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause... CVE-2026-78437 is fixed in 27 products on 1 platform, first by DEBIAN-CVE-2026-78437, released September 24, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-78437 - Priority: High - CVSS: 7.3 (high) - EPSS: 0.0051 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 23, 2026 ## Description Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121. 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 | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libtcnative-1-0 opensuse-leap 16.0 | 1.3.9-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | libtcnative-1-0 sles 15.6 | 1.3.9-150600.16.9.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | libtcnative-1-0 sles 15.7 | 1.3.9-150600.16.9.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | libtcnative-1-0 sles 16.0 | 1.3.9-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | libtcnative-2-0 opensuse-leap 16.0 | 2.0.16-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | libtcnative-2-0 sles 16.0 | 2.0.16-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat opensuse-leap 16.0 | 9.0.122-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | tomcat sles 15.6 | 9.0.122-150200.123.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat sles 15.7 | 9.0.122-150200.123.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat sles 16.0 | 9.0.122-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat10 Debian 14 | 10.1.60-1 | [DEBIAN-CVE-2026-78437](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78437.md) | Sep 24, 2026 | | Linux | tomcat10 amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10 opensuse-leap 16.0 | 10.1.60-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | tomcat10 sles 15.6 | 10.1.60-150200.5.82.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat10 sles 15.7 | 10.1.60-150200.5.82.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat10 sles 16.0 | 10.1.60-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat10-admin-webapps amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-docs-webapp amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-el-5.0-api amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-jsp-3.1-api amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-lib amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-servlet-6.0-api amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-webapps amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat11 amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11 opensuse-leap 16.0 | 11.0.26-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | tomcat11 sles 15.6 | 11.0.26-150600.13.36.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | tomcat11 sles 15.7 | 11.0.26-150600.13.36.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | tomcat11 sles 16.0 | 11.0.26-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat11-admin-webapps amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-docs-webapp amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-el-6.0-api amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-jsp-4.0-api amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-lib amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-servlet-6.1-api amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-webapps amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat9 Debian 12.15 (bookworm) | 9.0.70-2 | [DEBIAN-CVE-2026-78437](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78437.md) | Sep 24, 2026 | | Linux | tomcat9 Debian 13.5 (trixie) | 9.0.70-2 | [DEBIAN-CVE-2026-78437](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78437.md) | Sep 24, 2026 | | Linux | tomcat9 Debian 14 | 9.0.70-2 | [DEBIAN-CVE-2026-78437](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78437.md) | Sep 24, 2026 | | Linux | tomcat9 amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-admin-webapps amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-docs-webapp amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-el-3.0-api amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-jsp-2.3-api amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-lib amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-servlet-4.0-api amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-webapps amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | --- Data as of 2026-11-07T18:46:35Z UTC. 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