Bug 2488421 (CVE-2026-50020)

Summary: CVE-2026-50020 netty-codec-http: Netty: Data manipulation via request-boundary confusion in HttpObjectDecoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aazores, abrianik, anthomas, ant, anujha, aschwart, asoldano, aszczucz, ataylor, avibelli, bbaranow, bbrownin, bgeorges, bmaxwell, boliveir, bstansbe, ccranfor, cescoffi, chfoley, cmah, dandread, dbruscin, dhanak, dkreling, dlofthou, drichtar, drosa, dsimansk, eaguilar, ebaron, ehelms, ehugonne, ewittman, fmariani, fmongiar, ggainey, ggrzybek, gmalinko, gsmet, istudens, ivassile, iweiss, janstey, jkoehler, jmartisk, jnethert, jolong, jpasqual, jpechane, jraez, juwatts, jwon, kaycoth, kgaikwad, kingland, kvanderr, lphiri, lthon, manderse, mcarlett, mhulan, mnovotny, mosmerov, mposolda, mstipich, msvehla, nipatil, nmoumoul, nwallace, olubyans, osousa, pantinor, parichar, pberan, pcreech, pesilva, pgallagh, pjindal, pmackay, probinso, rchan, rexwhite, rgodfrey, rguimara, rkubis, rmartinc, rruss, rstancel, rstepani, rsvoboda, sausingh, sbiarozk, sdawley, smallamp, ssilvert, sthirugn, sthorger, swoodman, tasato, tcunning, thjenkin, tmalecek, tqvarnst, vdosoudi, vmuzikar, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Netty. The HttpObjectDecoder component, which processes incoming HTTP requests, incorrectly skips certain control characters and whitespace before reading the first request line. This behavior, which goes beyond standard HTTP protocol requirements, can lead to request-boundary confusion in systems that use pipelined or multiplexed transports. An attacker could exploit this to cause a front-end component to misinterpret HTTP request boundaries, potentially resulting in low integrity impact, such as unintended data manipulation.
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Description OSIDB Bzimport 2026-06-12 16:02:14 UTC 
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, before reading the first request-line, `HttpObjectDecoder` skips every byte for which `Character.isISOControl(b)` is `true` (0x00–0x1F and 0x7F) as well as all whitespace. RFC 9112 §2.2 only asks servers to ignore empty CRLF lines preceding the request-line — a carefully scoped robustness allowance intended to handle HTTP/1.0 POST workarounds. Silently absorbing NUL bytes, SOH, STX, and other non-CRLF control characters goes significantly beyond this, and can be exploited for request-boundary confusion in pipelined or multiplexed transports where a front-end component treats those bytes differently. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Comment 3 errata-xmlrpc 2026-08-04 14:00:26 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1

Via RHSA-2026:50085 https://access.redhat.com/errata/RHSA-2026:50085