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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 08 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 14:15:00 +0000

Type Values Removed Values Added
Title HTTP Request Smuggling via Malformed Chunked Requests in Jetty

Tue, 08 Sep 2026 13:45:00 +0000

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse jetty
Vendors & Products Eclipse
Eclipse jetty

Tue, 08 Sep 2026 12:30:00 +0000

Type Values Removed Values Added
Description 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.
Weaknesses CWE-444
References
Metrics cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published:

Updated: 2026-09-08T14:21:55.816Z

Reserved: 2026-08-07T07:32:16.708Z

Link: CVE-2026-19203

cve-icon Vulnrichment

Updated: 2026-09-08T14:21:47.443Z

cve-icon NVD

Status : Deferred

Published: 2026-09-08T13:17:18.520

Modified: 2026-09-08T15:18:42.667

Link: CVE-2026-19203

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T14:00:19Z

Weaknesses