CVE-2025-1948 Eclipse Jetty HTTP clients can increase memory allocation
An attacker can cause a denial of service by sending a large HTTP/2 header size setting, forcing the server to exhaust memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-1948?
CVE-2025-1948 is a high-severity denial of service vulnerability in Eclipse Jetty, published on 8 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Eclipse Jetty versions 12.0.0 to 12.0.16 included, an HTTP/2 client can specify a very large value for the HTTP/2 settings parameter SETTINGS_MAX_HEADER_LIST_SIZE. The Jetty HTTP/2 server does not perform validation on this setting, and tries to allocate a ByteBuffer of the specified capacity to encode HTTP responses, likely resulting in OutOfMemoryError being thrown, or even the JVM process exiting.
Weakness: CWE-400
Which versions are affected by CVE-2025-1948?
2 open source packages ship an affected version, including org.eclipse.jetty.http2:jetty-http2-common. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.eclipse.jetty.http2:jetty-http2-common Maven | From 12.0.0 | 12.0.17 |
org.eclipse.jetty.http2:jetty-http2-common Maven | From 12.0.0 | 12.0.17 |
Products include Eclipse Jetty.
How do I fix CVE-2025-1948?
Upgrade org.eclipse.jetty.http2:jetty-http2-common to 12.0.17 or later.
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-2025-1948 being exploited?
There is no known exploitation of CVE-2025-1948 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
- CVE-2019-17638 Operation on a Resource after Expiration or Release in Jetty Server
- CVE-2018-12538 Access and integrity issue within Eclipse Jetty
- CVE-2026-10050 Digest authentication lossy encoding
- CVE-2025-5115 MadeYouReset HTTP/2 vulnerability
Sources
Also known as CLEANSTART-2026-EO53976, CLEANSTART-2026-MS35151, DEBIAN-CVE-2025-1948, GHSA-889j-63jv-qhr8, MINI-cvqq-pphf-wj8m, ROOT-APP-MAVEN-CVE-2025-1948 and 1 more.