Bug 2449006 (CVE-2026-4424)

Summary:	CVE-2026-4424 libarchive: libarchive: Information disclosure via heap out-of-bounds read in RAR archive processing
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.	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:	2449007, 2449008, 2449009
Bug Blocks:

Description OSIDB Bzimport 2026-03-19 12:25:44 UTC

A Heap Out-of-Bounds Read vulnerability exists in the RAR archive processing logic of the libarchive library. The issue arises from improper validation of the LZSS sliding window size after transitions between compression methods (PPMd and LZSS). Due to a mismatch between the allocated buffer size and the expected dictionary size, the copy_from_lzss_window() function performs out-of-bounds memory reads. This allows a specially crafted RAR archive to leak heap memory through the archive_read_data() API before integrity checks (CRC) are enforced. The vulnerability can be exploited remotely without authentication or user interaction in systems that automatically process archives, leading to disclosure of sensitive information.

Comment 2 errata-xmlrpc 2026-04-16 14:47:33 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:8492 https://access.redhat.com/errata/RHSA-2026:8492

Comment 3 errata-xmlrpc 2026-04-16 16:09:56 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:8510 https://access.redhat.com/errata/RHSA-2026:8510

Comment 4 errata-xmlrpc 2026-04-16 16:40:23 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:8517 https://access.redhat.com/errata/RHSA-2026:8517

Comment 5 errata-xmlrpc 2026-04-16 16:43:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:8521 https://access.redhat.com/errata/RHSA-2026:8521

Comment 6 errata-xmlrpc 2026-04-16 18:12:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:8534 https://access.redhat.com/errata/RHSA-2026:8534

Comment 7 errata-xmlrpc 2026-04-20 02:15:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:8867 https://access.redhat.com/errata/RHSA-2026:8867

Comment 8 errata-xmlrpc 2026-04-20 02:48:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:8864 https://access.redhat.com/errata/RHSA-2026:8864

Comment 9 errata-xmlrpc 2026-04-20 02:49:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:8865 https://access.redhat.com/errata/RHSA-2026:8865

Comment 10 errata-xmlrpc 2026-04-20 03:43:23 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:8873 https://access.redhat.com/errata/RHSA-2026:8873

Comment 11 errata-xmlrpc 2026-04-20 03:55:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:8866 https://access.redhat.com/errata/RHSA-2026:8866

Comment 12 errata-xmlrpc 2026-04-20 05:15:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:8908 https://access.redhat.com/errata/RHSA-2026:8908

Comment 13 errata-xmlrpc 2026-04-20 13:04:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:9026 https://access.redhat.com/errata/RHSA-2026:9026

Comment 14 errata-xmlrpc 2026-04-22 05:59:41 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:9592 https://access.redhat.com/errata/RHSA-2026:9592

Comment 15 errata-xmlrpc 2026-04-30 12:10:56 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.16

Via RHSA-2026:10097 https://access.redhat.com/errata/RHSA-2026:10097

Comment 18 errata-xmlrpc 2026-05-05 17:49:48 UTC

This issue has been addressed in the following products:

  RHEL-8 based Middleware Containers

Via RHSA-2026:13812 https://access.redhat.com/errata/RHSA-2026:13812

Comment 22 errata-xmlrpc 2026-05-08 20:57:04 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.12

Via RHSA-2026:12274 https://access.redhat.com/errata/RHSA-2026:12274