Description
The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 10.1.0-M1 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60, 8.5.0 to 8.5.77 | — |
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 | tomcat9 | 9.0.62-1 | — |
| Debian 13 | tomcat9 | 9.0.62-1 | — |
| Debian 12 | tomcat9 | 9.0.62-1 | — |
| Debian 11 | tomcat9 | 9.0.43-2~deb11u4 | DSA-5265-1 |
| Debian 10 | tomcat9 | 9.0.31-1~deb10u7 | DLA-3160-1 |
Ubuntu
Security tracker ↗| 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 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 5 | jws5 +1 | 1-8.el9jws | RHSA-2022:7272 |
| Red Hat JBoss Web Server 5 | jws5-ecj | 4.20.0-1.redhat_00002.1.el7jws | RHSA-2022:7272 |
| Red Hat JBoss Web Server 5 | jws5-javapackages-tools +1 | 3.4.1-5.15.11.el9jws | RHSA-2022:7272 |
| Red Hat JBoss Web Server 5 | jws5-jboss-logging | 3.4.1-1.Final_redhat_00001.1.el9jws | RHSA-2022:7272 |
| Red Hat JBoss Web Server 5 | jws5-mod_cluster +1 | 1.4.3-2.Final_redhat_00002.1.el9jws | RHSA-2022:7272 |
| Red Hat JBoss Web Server 5 | jws5-tomcat +11 | 9.0.62-9.redhat_00005.1.el7jws | RHSA-2022:7272 |
| Red Hat JBoss Web Server 5 | jws5-tomcat-native | 1.2.31-10.redhat_10.el7jws | RHSA-2022:7272 |
| Red Hat JBoss Web Server 5 | jws5-tomcat-vault +1 | 1.1.8-4.Final_redhat_00004.1.el9jws | RHSA-2022:7272 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | tomcat | 9.0.36-150100.4.81.1 | SUSE-SU-2022:4257-1 |
| SLES 15 | tomcat | 9.0.36-150000.3.101.2 | SUSE-SU-2022:4221-1 |
| SLES 12 SP5 | tomcat | 9.0.36-3.90.1 | SUSE-SU-2026:1058-1, SUSE-SU-2022:4009-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | tomcat | 9.0.36-150100.4.81.1 | SUSE-SU-2022:4257-1 |
| SLES for SAP 15 | tomcat | 9.0.36-150000.3.101.2 | SUSE-SU-2022:4221-1 |
| SLES for SAP 12 SP5 | tomcat | 9.0.36-3.90.1 | SUSE-SU-2022:4009-1 |
| SLE HPC 15 SP1 | tomcat | 9.0.36-150100.4.81.1 | SUSE-SU-2022:4257-1 |
| SLE HPC 15 | tomcat | 9.0.36-150000.3.101.2 | SUSE-SU-2022:4221-1 |
| SUSE Enterprise Storage 6 | tomcat | 9.0.36-150100.4.81.1 | SUSE-SU-2022:4257-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.43-11.1 | openSUSE-SU-2024:12534-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.14-1.1 | openSUSE-SU-2024:13441-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tomcat9 +7 | 1:9.0.71-1.amzn2023.0.2 | ALAS2023-2023-176 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat:tomcat | >= 8.5.0, < 8.5.78 | 8.5.78 | GHSA-jx7c-7mj5-9438 |
| Maven | org.apache.tomcat:tomcat | >= 9.0.0-M1, < 9.0.62 | 9.0.62 | GHSA-jx7c-7mj5-9438 |
| Maven | org.apache.tomcat:tomcat | >= 10.0.0-M1, < 10.0.20 | 10.0.20 | GHSA-jx7c-7mj5-9438 |
| Maven | org.apache.tomcat:tomcat | >= 10.1.0-M1, < 10.1.0-M14 | 10.1.0-M14 | GHSA-jx7c-7mj5-9438 |
Advisories 14
- RHSA-2022:7272 Red Hat Security Advisory: Red Hat JBoss Web Server 5.7.0 release and security update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- SUSE-SU-2026:1058-1 Security update for tomcat SUSE / openSUSE Security Updates · Mar 27, 2026
- WID-SEC-2022-1558 Apache Tomcat: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Mar 26, 2026
- DSA-5265-1 tomcat9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3160-1 tomcat9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2022:4221-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4257-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13441-1 tomcat10-10.1.14-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12534-1 tomcat-9.0.43-11.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4009-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2025-0123 Kwetsbaarheden verholpen in Oracle Database Producten NCSC-NL (Netherlands) · Apr 16, 2025
- WID-SEC-2024-1238 HPE HP-UX: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 27, 2024
- WID-SEC-2024-0528 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 29, 2024
- ALAS2023-2023-176 Important: tomcat9 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 3, 2023