CVE-2018-12545 Uncontrolled Resource Consumption in org.eclipse.jetty:jetty-server

What is CVE-2018-12545?

CVE-2018-12545 is a high-severity denial of service vulnerability in Eclipse Jetty, published on 27 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Eclipse Jetty version 9.3.x and 9.4.x, the server is vulnerable to Denial of Service conditions if a remote client sends either large SETTINGs frames container containing many settings, or many small SETTINGs frames. The vulnerability is due to the additional CPU and memory allocations required to handle changed settings.

Weakness: CWE-770, CWE-400

Which versions are affected by CVE-2018-12545?

4 open source packages ship an affected version, including org.eclipse.jetty:jetty-server. It affects 2 products.

Products include Eclipse Jetty, Fedoraproject Fedora.

How do I fix CVE-2018-12545?

Upgrade org.eclipse.jetty:jetty-server to a fixed version for your release line: 9.3.25.v20180904 or 9.4.12.v20180830.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-12545 being exploited?

There is no known exploitation of CVE-2018-12545 in the wild and no public exploit code.

Other vulnerabilities in Eclipse Jetty

• CVE-2016-4800 Jetty contains an alias issue that could allow unauthenticated remote code execution due to specially crafted request Critical 9.8
• CVE-2019-17638 Operation on a Resource after Expiration or Release in Jetty Server Critical 9.4
• CVE-2018-12538 Access and integrity issue within Eclipse Jetty High 8.8
• CVE-2026-10050 Digest authentication lossy encoding High 8.7
• CVE-2025-5115 MadeYouReset HTTP/2 vulnerability High 7.7

All Eclipse Jetty vulnerabilities

Sources

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

Also known as CLEANSTART-2026-BS31525, GHSA-h2f4-v4c4-6wx4.