CVE-2023-42795 Apache Tomcat: Failure during request clean-up leads to sensitive data leaking to subsequent requests

What is CVE-2023-42795?

CVE-2023-42795 is a medium-severity vulnerability in Apache Tomcat, published on 10 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Incomplete Cleanup vulnerability in Apache Tomcat.When recycling various internal objects in Apache Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.80 and from 8.5.0 through 8.5.93, an error could cause Tomcat to skip some parts of the recycling process leading to information leaking from the current request/response to the next. Older, EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fixes the issue.

Weakness: CWE-459

Which versions are affected by CVE-2023-42795?

33 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core, tomcat and org.apache.tomcat:tomcat. It affects 2 products.

Products include Apache Tomcat, Debian Debian Linux.

How do I fix CVE-2023-42795?

Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 10.1.14, 11.0.0-M12, 8.5.94 or 9.0.81.

Is CVE-2023-42795 being exploited?

There is no known exploitation of CVE-2023-42795 in the wild and no public exploit code.

Other vulnerabilities in Apache Tomcat

• CVE-2025-24813 Apache Tomcat Path Equivalence Exploited Critical 10.0
• CVE-2016-8735 Apache Tomcat Remote Code Execution Exploited Critical 9.8
• CVE-2017-12617 Apache Tomcat Remote Code Execution Exploited High 8.1
• CVE-2017-12615 Apache Tomcat on Windows Remote Code Execution Exploited High 8.1
• CVE-2026-34486 Apache Tomcat Missing Encryption of Sensitive Data Exploited High 7.5

All Apache Tomcat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-tomcat-2023-42795, CLSA-2025-1737569580, CLSA-2025-1739387678, CLSA-2025-1741286028, CLSA-2025-1765411677, DEBIAN-CVE-2023-42795 and 2 more.