CVE-2023-26048 OutOfMemoryError for large multipart without filename in Eclipse Jetty

What is CVE-2023-26048?

CVE-2023-26048 is a medium-severity denial of service vulnerability in Eclipse Jetty, published on 18 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Jetty is a java based web server and servlet engine. In affected versions servlets with multipart support (e.g. annotated with `@MultipartConfig`) that call `HttpServletRequest.getParameter()` or `HttpServletRequest.getParts()` may cause `OutOfMemoryError` when the client sends a multipart request with a part that has a name but no filename and very large content. This happens even with the default settings of `fileSizeThreshold=0` which should stream the whole part content to disk. An attacker client may send a large multipart request and cause the server to throw `OutOfMemoryError`. However, the server may be able to recover after the `OutOfMemoryError` and continue its service -- although it may take some time. This issue has been patched in versions 9.4.51, 10.0.14, and 11.0.14. Users are advised to upgrade. Users unable to upgrade may set the multipart parameter `maxRequestSize` which must be set to a non-negative value, so the whole multipart content is limited (although still read into memory).

Weakness: CWE-770, CWE-400

Which versions are affected by CVE-2023-26048?

6 open source packages ship an affected version, including org.eclipse.jetty:jetty-server. It affects 1 product.

Products include Eclipse Jetty.

How do I fix CVE-2023-26048?

Upgrade org.eclipse.jetty:jetty-server to a fixed version for your release line: 9.4.51.v20230217, 10.0.14 or 11.0.14.

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-2023-26048 being exploited?

There is no known exploitation of CVE-2023-26048 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

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-SC99886, CLEANSTART-2026-YU71796, DEBIAN-CVE-2023-26048, GHSA-qw69-rqj8-6qw8, UBUNTU-CVE-2023-26048.