Bug 2476511 (CVE-2026-43512)

Summary:	CVE-2026-43512 tomcat-coyote: Apache Tomcat: Authentication bypass via digest 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, anujha, 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, yozone
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. When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password "null". This allows a remote attacker to bypass security controls.	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:	2482422, 2482423, 2482424
Bug Blocks:

Description OSIDB Bzimport 2026-05-12 16:01:48 UTC

DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication 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 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from before 7.0.0.
Older unsupported versions any also be affect

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

Comment 2 errata-xmlrpc 2026-07-14 16:08:42 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0.0

Via RHSA-2026:39189 https://access.redhat.com/errata/RHSA-2026:39189

Comment 3 errata-xmlrpc 2026-07-14 16:11:36 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0 on RHEL 10
  Red Hat JBoss Web Server 7.0 on RHEL 8
  Red Hat JBoss Web Server 7.0 on RHEL 9

Via RHSA-2026:39188 https://access.redhat.com/errata/RHSA-2026:39188

Comment 4 errata-xmlrpc 2026-07-22 12:22:49 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2.4

Via RHSA-2026:43402 https://access.redhat.com/errata/RHSA-2026:43402

Comment 5 errata-xmlrpc 2026-07-22 12:23:33 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2 on RHEL 10
  Red Hat JBoss Web Server 6.2 on RHEL 8
  Red Hat JBoss Web Server 6.2 on RHEL 9

Via RHSA-2026:43401 https://access.redhat.com/errata/RHSA-2026:43401