# CVE-2026-68763: tomcat: Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset

CVE-2026-68763 is fixed in 23 products on 1 platform, first by RHSA-2026:92863, released August 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-68763
- Priority: High
- CVSS: 8.2 (high)
- EPSS: 0.0075
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 25, 2026

## Description

Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | jws6-tomcat RHEL 10 | 10.1.49-16.redhat_00016.1.el10jws | [RHSA-2026:73981](https://patchblox.com/security/data/fix/linux/rhsa-2026-73981.md) | Aug 25, 2026 |
| Linux | jws7-tomcat RHEL 10 | 11.0.21-7.redhat_00006.1.el10jws | [RHSA-2026:76952](https://patchblox.com/security/data/fix/linux/rhsa-2026-76952.md) | Aug 25, 2026 |
| Linux | tomcat RHEL 10 | 10.1.49-2.el10_0 | [RHSA-2026:92863](https://patchblox.com/security/data/fix/linux/rhsa-2026-92863.md) | Aug 25, 2026 |
| Linux | tomcat RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat opensuse-leap 16.0 | 9.0.121-160000.1.1 | [OPENSUSE-SU-2026:21823-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21823-1.md) | Sep 9, 2026 |
| Linux | tomcat rocky 9 | 1:9.0.121-1.el9_8 | [RLSA-2026:93469](https://patchblox.com/security/data/fix/linux/rlsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat sles 15.6 | 9.0.121-150200.120.1 | [SUSE-SU-2026:4203-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4203-1.md) | Sep 16, 2026 |
| Linux | tomcat sles 15.7 | 9.0.121-150200.120.1 | [SUSE-SU-2026:4203-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4203-1.md) | Sep 16, 2026 |
| Linux | tomcat sles 16.0 | 9.0.121-160000.1.1 | [SUSE-SU-2026:23720-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23720-1.md) | Sep 9, 2026 |
| Linux | tomcat-admin-webapps RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat-admin-webapps almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat-admin-webapps almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-admin-webapps ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat-admin-webapps ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-docs-webapp RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat-docs-webapp almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat-docs-webapp almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-docs-webapp ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat-docs-webapp ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-el-3.0-api RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat-el-3.0-api almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-el-3.0-api ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-el-5.0-api almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat-el-5.0-api ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat-jsp-2.3-api RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat-jsp-2.3-api almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-jsp-2.3-api ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-jsp-3.1-api almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat-jsp-3.1-api ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat-lib RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat-lib almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat-lib almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-lib ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat-lib ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-servlet-4.0-api RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat-servlet-4.0-api almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-servlet-4.0-api ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-servlet-6.0-api almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat-servlet-6.0-api ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat-webapps RHEL 9 | 1:9.0.121-1.el9_8 | [RHSA-2026:93469](https://patchblox.com/security/data/fix/linux/rhsa-2026-93469.md) | Nov 3, 2026 |
| Linux | tomcat-webapps almalinux 10 | 1:10.1.49-5.el10_2.alma.1 | [ALSA-2026:92862](https://patchblox.com/security/data/fix/linux/alsa-2026-92862.md) | Nov 11, 2026 |
| Linux | tomcat-webapps almalinux 9 | 1:9.0.121-1.el9_8 | [ALSA-2026:93469](https://patchblox.com/security/data/fix/linux/alsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat-webapps ol 10 | 1:10.1.49-5.el10_2 | [ELSA-2026-92862](https://patchblox.com/security/data/fix/linux/elsa-2026-92862.md) | Nov 7, 2026 |
| Linux | tomcat-webapps ol 9 | 1:9.0.121-1.el9_8 | [ELSA-2026-93469](https://patchblox.com/security/data/fix/linux/elsa-2026-93469.md) | Nov 7, 2026 |
| Linux | tomcat10 Debian 12.15 (bookworm) | 10.1.60-1~deb12u1 | [DEBIAN-CVE-2026-68763](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68763.md) | Aug 27, 2026 |
| Linux | tomcat10 Debian 14 | 10.1.60-1 | [DEBIAN-CVE-2026-68763](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68763.md) | Aug 27, 2026 |
| Linux | tomcat10 opensuse-leap 16.0 | 10.1.59-160000.1.1 | [OPENSUSE-SU-2026:21810-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21810-1.md) | Sep 8, 2026 |
| Linux | tomcat10 sles 15.6 | 10.1.59-150200.5.79.1 | [SUSE-SU-2026:4119-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4119-1.md) | Sep 10, 2026 |
| Linux | tomcat10 sles 15.7 | 10.1.59-150200.5.79.1 | [SUSE-SU-2026:4119-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4119-1.md) | Sep 10, 2026 |
| Linux | tomcat10 sles 16.0 | 10.1.59-160000.1.1 | [SUSE-SU-2026:23711-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23711-1.md) | Sep 8, 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 | 11.0.25-160000.1.1 | [OPENSUSE-SU-2026:21811-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21811-1.md) | Sep 8, 2026 |
| Linux | tomcat11 sles 15.6 | 11.0.25-150600.13.33.2 | [SUSE-SU-2026:4114-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4114-1.md) | Sep 9, 2026 |
| Linux | tomcat11 sles 15.7 | 11.0.25-150600.13.33.2 | [SUSE-SU-2026:4114-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4114-1.md) | Sep 9, 2026 |
| Linux | tomcat11 sles 16.0 | 11.0.25-160000.1.1 | [SUSE-SU-2026:23710-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23710-1.md) | Sep 8, 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-2026-68763](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68763.md) | Aug 27, 2026 |
| Linux | tomcat9 Debian 13.5 (trixie) | 9.0.70-2 | [DEBIAN-CVE-2026-68763](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68763.md) | Aug 27, 2026 |
| Linux | tomcat9 Debian 14 | 9.0.70-2 | [DEBIAN-CVE-2026-68763](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68763.md) | Aug 27, 2026 |

---

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