CVE-2026-19203
Published:September 08, 2026
Updated:September 22, 2026
A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary proxy to interpret different request boundaries, potentially resulting in HTTP request smuggling.
This is caused by Jetty accepting a lone LF character as a terminator in parts of chunked request parsing. Depending on the Jetty version and configured HTTP compliance mode, this may occur in chunk extensions, chunk data termination, or trailer termination.
Affected Packages
https://github.com/jetty/jetty.project.git (GITHUB):
Affected version(s) >=jetty-12.1.0.alpha0 <jetty-12.1.12Fix Suggestion:
Update to version jetty-12.1.12https://github.com/jetty/jetty.project.git (GITHUB):
Affected version(s) >=jetty-12.0.0.alpha0 <jetty-12.0.38Fix Suggestion:
Update to version jetty-12.0.38org.eclipse.jetty:jetty-http (JAVA):
Affected version(s) >=12.1.0.alpha0 <12.1.12Fix Suggestion:
Update to version 12.1.12org.eclipse.jetty:jetty-http (JAVA):
Affected version(s) >=12.0.0.alpha0 <12.0.38Fix Suggestion:
Update to version 12.0.38Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
EPSS
Base Score:
0.29