Bug 2521308 (CVE-2026-62380)

Summary:	CVE-2026-62380 io.netty/netty-codec-socks: Netty: Null byte and CRLF injection in SOCKS client encoders can lead to domain spoofing
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anthomas, ant, anujha, aschwart, asoldano, asyoung, aszczucz, ataylor, avibelli, bbaranow, bbrownin, bgeorges, bmaxwell, boliveir, bstansbe, ccranfor, cescoffi, cmah, dandread, dbruscin, dhanak, dkreling, dlofthou, drichtar, drosa, dsimansk, ehelms, ehugonne, ewittman, fmariani, fmongiar, ggainey, gmalinko, gsmet, gtanzill, istudens, ivassile, iweiss, janstey, jbuscemi, jhollowa, jmartisk, jnethert, jpasqual, jpechane, juwatts, jwon, kaycoth, kingland, kvanderr, lthon, manderse, mcarlett, mdellweg, mhulan, mnovotny, mosmerov, mposolda, msvehla, nipatil, nmoumoul, nwallace, olubyans, osousa, pantinor, pberan, pcreech, pdelbell, pesilva, pgallagh, pjindal, pmackay, prichard, probinso, rchan, rguimara, rkubis, rmartinc, rruss, rstancel, rstepani, rsvoboda, sausingh, sbiarozk, sdawley, smallamp, ssilvert, sthirugn, sthorger, tcunning, thjenkin, tmalecek, tqvarnst, vdosoudi, vmuzikar, yfang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Netty SOCKS client encoders. This vulnerability allows a remote attacker to inject null bytes or Carriage Return Line Feed (CRLF) characters into domain address and authentication fields due to insufficient validation. By manipulating these fields, an attacker can truncate or alter values, potentially leading to domain spoofing, SOCKS4 user ID truncation, authentication data injection, and protocol confusion.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2526290
Bug Blocks:

Description OSIDB Bzimport 2026-08-22 12:52:00 UTC

Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEncoder) client encoders, which fail to validate domain address and authentication (username/password) fields. An attacker able to control these fields can inject null bytes or CRLF characters to truncate or alter values, potentially enabling domain spoofing, SOCKS4 userid truncation, authentication data injection, and protocol confusion. Fixed in 4.2.17.Final and 4.1.137.Final.