Please note that, except in rare circumstances, binary patches are not
produced for individual vulnerabilities. To obtain the binary fix for a
particular vulnerability you should upgrade to an Apache Tomcat version
where that vulnerability has been fixed.
Source patches, usually in the form of references to commits, may be
provided in either in a vulnerability announcement and/or the
vulnerability details listed on these pages. These source patches may be
used by users wishing to build their own local version of Tomcat with just
that security patch rather than upgrade. Please note that an exercise is
currently underway to add links to the commits for all the
vulnerabilities listed on these pages.
Lists of security problems fixed in released versions of Apache Tomcat
Lists of security problems fixed in versions of Apache Tomcat that may
be downloaded from the archives are also available:
The ASF takes a very active stance in eliminating security problems and
denial of service attacks against Tomcat.
We strongly encourage folks to report such problems to our private
security mailing list first, before disclosing them in a public forum.
Reports of problems that require any of the following will be considered
out of scope and will not be accepted by the Tomcat security team. The
list is not exhaustive.
- Access to Tomcat's configuration files.
- Deployment of a vulnerable web application.
- Deployment of a malicious web application unless a SecurityManager
is configured with an appropriate security policy and the web
application is able to bypass a restriction enforced by the
Please note that the security mailing list should only be used
for reporting undisclosed security vulnerabilities in Tomcat and managing
the process of fixing such vulnerabilities. We cannot accept regular bug
reports or other queries at this address. All mail sent to this address
that does not relate to an undisclosed security problem in the Tomcat
source code will be ignored.
If you need to report a bug that isn't an undisclosed security
vulnerability, please use the bug reporting
- how to configure Tomcat securely
- if a vulnerability applies to your particular application
- obtaining further information on a published vulnerability
- availability of patches and/or new releases
should be addressed to the users mailing list. Please see the
mailing lists page for details of how to
The private security mailing address is:
Note that all networked servers are subject to denial of service attacks,
and we cannot promise magic workarounds to generic problems (such as a
client streaming lots of data to your server, or re-requesting the same
URL repeatedly). In general our philosophy is to avoid any attacks which
can cause the server to consume resources in a non-linear relationship to
the size of inputs.
Please report any errors or omissions to