Bug 2443261 (CVE-2026-28368) - CVE-2026-28368 undertow: Undertow: Request smuggling via inconsistent header parsing
Summary: CVE-2026-28368 undertow: Undertow: Request smuggling via inconsistent header ...
Keywords:
Status: NEW
Alias: CVE-2026-28368
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-27 04:44 UTC by OSIDB Bzimport
Modified: 2026-03-27 16:00 UTC (History)
50 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-02-27 04:44:48 UTC 
Undertow splits header names from values on either space or colon, whichever comes first. This allows for the construction of crafted requests with headers that are visible only to Undertow, but not upstream proxies, which can be used to launch request smuggling attacks.
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