CVE-2025-1948: Eclipse Jetty HTTP clients can increase memory allocation
First published: Thu May 08 2025(Updated: )
### Original Report 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. ### Impact Remote peers can cause the JVM to crash or continuously report OOM. ### Patches 12.0.17 ### Workarounds No workarounds. ### References https://github.com/jetty/jetty.project/issues/12690
Credit: emo@eclipse.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mortbay Jetty | >=12.0.0<=12.0.16 | |
| maven/org.eclipse.jetty.http2:jetty-http2-common | >=12.0.0<=12.0.16 | 12.0.17 |
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Reference Links
- https://github.com/jetty/jetty.project/security/advisories/GHSA-889j-63jv-qhr8
- https://gitlab.eclipse.org/security/cve-assignement/-/issues/56
- https://nvd.nist.gov/vuln/detail/CVE-2025-1948
- https://github.com/jetty/jetty.project/issues/12690
- https://github.com/jetty/jetty.project/commit/c8c2515936ef968dc8a3cecd9e79d1e69291e4bb
- https://github.com/advisories/GHSA-889j-63jv-qhr8 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2025-1948?
CVE-2025-1948 has a high severity rating due to the potential for denial of service caused by unvalidated HTTP/2 header sizes.
How do I fix CVE-2025-1948?
To fix CVE-2025-1948, update Eclipse Jetty to version 12.0.17 or later where the vulnerability is patched.
What versions of Eclipse Jetty are affected by CVE-2025-1948?
Eclipse Jetty versions from 12.0.0 to 12.0.16 are affected by CVE-2025-1948.
What type of attack is possible with CVE-2025-1948?
CVE-2025-1948 allows an attacker to cause denial of service by exploiting the error in handling large header list sizes.
Is there a known exploit for CVE-2025-1948?
As of now, there are no publicly disclosed active exploits for CVE-2025-1948, but the vulnerability poses a significant risk if left unpatched.
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