Description
An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Apache Tomcat | Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36, 8.5.1 to 8.5.56 | — |
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 | 9.0.37-1 | — |
| Debian 13 | tomcat9 | 9.0.37-1 | — |
| Debian 12 | tomcat9 | 9.0.37-1 | — |
| Debian 10 | tomcat9 | 9.0.31-1~deb10u2 | DSA-4727-1 |
| Debian 9 | tomcat8 | 8.5.54-0+deb9u3 | DLA-2286-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tomcat9 | 9.0.31-1ubuntu0.1 | USN-4596-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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-tomcat +9 | 9.0.30-5.redhat_6.1.el6jws | RHSA-2020:3306 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | tomcat | 9.0.36-3.6.1 | SUSE-SU-2020:2047-1 |
| SLES 15 SP1 | tomcat | 9.0.36-4.41.2 | SUSE-SU-2020:2046-1 |
| SLES 15 | tomcat | 9.0.36-3.65.2 | SUSE-SU-2020:2045-1 |
| SLES 12 SP5 | tomcat | 9.0.36-3.45.1 | SUSE-SU-2026:1058-1, SUSE-SU-2020:2037-1 |
| SLES 12 SP4 | tomcat | 9.0.36-3.45.1 | SUSE-SU-2020:2037-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | tomcat | 9.0.36-3.65.2 | SUSE-SU-2020:2045-1 |
| SLES for SAP 12 SP5 | tomcat | 9.0.36-3.45.1 | SUSE-SU-2020:2037-1 |
| SLES for SAP 12 SP4 | tomcat | 9.0.36-3.45.1 | SUSE-SU-2020:2037-1 |
| SLE HPC 15 | tomcat | 9.0.36-3.65.2 | SUSE-SU-2020:2045-1 |
| SUSE OpenStack Cloud Crowbar 9 | tomcat | 9.0.36-3.45.1 | SUSE-SU-2020:2037-1 |
| SUSE OpenStack Cloud 9 | tomcat | 9.0.36-3.45.1 | SUSE-SU-2020:2037-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.43-8.1 | openSUSE-SU-2024:12103-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.14-1.1 | openSUSE-SU-2024:13441-1 |
| openSUSE Leap 15.2 | tomcat | 9.0.36-lp152.2.4.1 | openSUSE-SU-2020:1111-1 |
| openSUSE Leap 15.1 | tomcat | 9.0.36-lp151.3.27.1 | openSUSE-SU-2020:1102-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat:tomcat | >= 10.0.0-M1, < 10.0.0-M6 | 10.0.0-M6 | GHSA-vf77-8h7g-gghp |
| Maven | org.apache.tomcat:tomcat | >= 9.0.0.M5, < 9.0.36 | 9.0.36 | GHSA-vf77-8h7g-gghp |
| Maven | org.apache.tomcat:tomcat | >= 8.5.1, < 8.5.56 | 8.5.56 | GHSA-vf77-8h7g-gghp |
| Maven | org.apache.tomcat:tomcat-coyote | >= 10.0.0-M1, < 10.0.0-M6 | 10.0.0-M6 | GHSA-vf77-8h7g-gghp |
| Maven | org.apache.tomcat:tomcat-coyote | >= 9.0.0.M5, < 9.0.36 | 9.0.36 | GHSA-vf77-8h7g-gghp |
| Maven | org.apache.tomcat:tomcat-coyote | >= 8.5.1, < 8.5.56 | 8.5.56 | GHSA-vf77-8h7g-gghp |
Advisories 18
- RHSA-2020:3306 Red Hat Security Advisory: Red Hat JBoss Web Server 5.3.2 security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- USN-4596-1 tomcat9 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2026:1058-1 Security update for tomcat SUSE / openSUSE Security Updates · Mar 27, 2026
- WID-SEC-2022-0519 Apache Tomcat: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Mar 26, 2026
- DSA-4727-1 tomcat9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2286-1 tomcat8 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:2037-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2045-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1111-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1102-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2046-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2047-1 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
- WID-SEC-2026-0205 Oracle MySQL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 25, 2026
- WID-SEC-2022-1375 JFrog Artifactory: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 12, 2025
- openSUSE-SU-2024:12103-1 tomcat-9.0.43-8.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2024-0528 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 29, 2024
- WID-SEC-2023-1048 Oracle Construction and Engineering: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 4, 2024
References
- https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E
- DSA-4727 vendor-advisory
- [debian-lts-announce] 20200722 [SECURITY] [DLA 2286-1] tomcat8 security update mailing-list
- openSUSE-SU-2020:1102 vendor-advisory
- openSUSE-SU-2020:1111 vendor-advisory
- [tomcat-dev] 20200818 [Bug 64671] HTTP/2 Stream.receivedData method throwing continuous NullPointerException in the logs mailing-list
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://security.netapp.com/advisory/ntap-20200724-0003/
- USN-4596-1 vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html