Bug 2507480 (CVE-2026-59900) - CVE-2026-59900 io.netty/netty-codec-http2: Netty: Improper header neutralization in netty-codec-http2
Summary: CVE-2026-59900 io.netty/netty-codec-http2: Netty: Improper header neutralizat...
Keywords:
Status: NEW
Alias: CVE-2026-59900
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-27 14:37 UTC by OSIDB Bzimport
Modified: 2026-07-27 15:33 UTC (History)
96 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-07-27 14:37:30 UTC 
Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final, the HTTP/2 encoder in netty-codec-http2 fails to properly neutralize special characters in HTTP headers. An attacker can craft specially formed HTTP/2 requests that inject arbitrary header content, allowing HTTP response splitting and header injection attacks. This issue is fixed in versions 4.1.136.Final and later.
Note You need to log in before you can comment on or make changes to this bug.