jetty12: A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary...
CVE-2026-19203 is fixed in jetty12 on 1 platform by DEBIAN-CVE-2026-19203 (version 12.0.39-1), released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jetty12 · Debian 14 | 12.0.39-1 | DEBIAN-CVE-2026-19203 | Sep 8, 2026 |
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