Description
Incorrect object recycling and re-use vulnerability in Apache Tomcat affecting HTTP/2 processing of asynchronous servlets can trigger request and/or response mix-up between users.
This issue affects Apache Tomcat: from 11.0.22 through 11.0.26, from 10.1.55 through 10.1.60, from 9.0.118 through 9.0.122.
Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.22 – ≤ 11.0.26, 10.1.55 – ≤ 10.1.60, 9.0.118 – ≤ 9.0.122 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tomcat10 +1 | No fix yet | — |
| Debian 14 | tomcat9 | 9.0.70-2 | — |
| Debian 13 | tomcat10 +1 | No fix yet | — |
| Debian 13 | tomcat9 | 9.0.70-2 | — |
| Debian 12 | tomcat10 | No fix yet | — |
| Debian 12 | tomcat9 | 9.0.70-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tomcat9 +2 | No fix yet | — |
| Ubuntu 26.04 LTS | tomcat9 +2 | No fix yet | — |
| Ubuntu 24.04 LTS | tomcat9 +1 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | tomcat9 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | tomcat9 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | tomcat8 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tomcat7 +1 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tomcat6 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLES 15 SP7 | tomcat10 | 10.1.61-150200.5.85.1 | SUSE-SU-2026:5073-1 |
| SLES 15 SP6 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLES 15 SP6 | tomcat10 | 10.1.61-150200.5.85.1 | SUSE-SU-2026:5073-1 |
| SLES 15 SP5 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLES 15 SP5 | tomcat10 | 10.1.61-150200.5.85.1 | SUSE-SU-2026:5073-1 |
| SLES 15 SP4 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLES 12 SP5 | libapr1 | 1.6.5-4.13.1 | SUSE-SU-2026:4927-1 |
| SLES 12 SP5 | libtcnative-1-0 | 1.3.9-3.9.1 | SUSE-SU-2026:4927-1 |
| SLES 12 SP5 | tomcat | 9.0.123-3.182.2 | SUSE-SU-2026:4927-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLES for SAP 15 SP6 | tomcat10 | 10.1.61-150200.5.85.1 | SUSE-SU-2026:5073-1 |
| SLES for SAP 15 SP5 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLES for SAP 15 SP5 | tomcat10 | 10.1.61-150200.5.85.1 | SUSE-SU-2026:5073-1 |
| SLES for SAP 15 SP4 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLE HPC 15 SP5 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
| SLE HPC 15 SP5 | tomcat10 | 10.1.61-150200.5.85.1 | SUSE-SU-2026:5073-1 |
| SLE HPC 15 SP4 | tomcat | 9.0.123-150200.126.1 | SUSE-SU-2026:5116-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.123-1.1 | openSUSE-SU-2026:12254-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.61-1.1 | openSUSE-SU-2026:12255-1 |
| openSUSE Tumbleweed | tomcat11 | 11.0.27-1.1 | openSUSE-SU-2026:12256-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tomcat10 +7 | 1:10.1.61-1.amzn2023.0.1 | ALAS2023-2026-3420 |
Advisories 8
- ALAS2023-2026-3420 Important: tomcat10 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 12, 2026
- WID-SEC-2026-4066 Apache Tomcat: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- SUSE-SU-2026:5116-1 Security update for tomcat SUSE / openSUSE Security Updates · Nov 5, 2026
- SUSE-SU-2026:5073-1 Security update for tomcat10 SUSE / openSUSE Security Updates · Nov 3, 2026
- SUSE-SU-2026:4927-1 Security update for libapr1, libtcnative-1-0, tomcat SUSE / openSUSE Security Updates · Oct 31, 2026
- openSUSE-SU-2026:12255-1 tomcat10-10.1.61-1.1 on GA media SUSE / openSUSE Security Updates · Oct 24, 2026
- openSUSE-SU-2026:12256-1 tomcat11-11.0.27-1.1 on GA media SUSE / openSUSE Security Updates · Oct 24, 2026
- openSUSE-SU-2026:12254-1 tomcat-9.0.123-1.1 on GA media SUSE / openSUSE Security Updates · Oct 24, 2026