Bug 2476516 (CVE-2026-42498)

Summary:	CVE-2026-42498 tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication.
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aakkiang, aschwart, asoldano, aszczucz, bbaranow, bmaxwell, boliveir, bstansbe, cfu, csutherl, dhanak, dlofthou, drichtar, drosa, dsoumis, edewata, gkimetto, gmalinko, ibek, istudens, ivassile, iweiss, janstey, jclere, jmagne, jrokos, jwon, mfargett, mharmsen, mnovotny, mosmerov, mposolda, msvehla, nwallace, pberan, pdelbell, pesilva, pjindal, plodge, pmackay, prisingh, rhel-process-autobot, rmartinc, rmaucher, rstancel, rstepani, sausingh, sdawley, skhandel, smaestri, snegrini, ssilvert, sthorger, szappis, taherrin, thjenkin, vchlup, vdosoudi, vmuzikar, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in Apache Tomcat. During WebSocket authentication, the HTTP Authentication Header can be exposed to unexpected hosts. This vulnerability leads to information disclosure, potentially allowing an attacker to gain access to sensitive authentication credentials.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2488250, 2488251, 2488253
Bug Blocks:

Description OSIDB Bzimport 2026-05-12 16:02:01 UTC

Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109.

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.