Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing

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Summary

CVECVE-2026-4424
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-19 15:16:28 UTC
Updated2026-05-09 00:16:29 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.003640000 probability, percentile 0.584480000 (date 2026-05-08)

Problem Types: CWE-125 | CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Libarchive Libarchive - All All All
Operating System Redhat Enterprise Linux 10.0 All All All
Operating System Redhat Enterprise Linux 6.0 All All All
Operating System Redhat Enterprise Linux 7.0 All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Operating System Redhat Enterprise Linux 9.0 All All All
Operating System Redhat Enterprise Linux Server Aus 8.2 All All All
Operating System Redhat Enterprise Linux Server Aus 8.4 All All All
Application Redhat Hardened Images - All All All
Application Redhat Openshift Container Platform 4.0 All All All
Application Redhat Openshift Container Platform 4.16 All All All
Application Redhat Openshift Container Platform For Arm64 4.16 All All All
Application Redhat Openshift Container Platform For Power 4.16 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.7.7-8.el10_1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 0:3.7.7-5.el10_0 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support unaffected 0:3.1.2-14.el7_9.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:3.3.3-7.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 0:3.3.2-8.el8_2.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:3.3.3-1.el8_4.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:3.3.3-1.el8_4.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:3.3.3-6.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 0:3.3.3-6.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 0:3.3.3-6.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:3.3.3-5.el8_8.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:3.3.3-5.el8_8.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.5.3-9.el9_7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.5.3-9.el9_7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:3.5.3-2.el9_0.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:3.5.3-5.el9_2.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:3.5.3-5.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:3.5.3-7.el9_6.1 * rpm Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4.12 unaffected 412.86.202604281506-0 * rpm Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4.16 unaffected 416.94.202604211449-0 * rpm Not specified
CNA Red Hat RHEL-8 Based Middleware Containers unaffected 7.13.5-4.1777325677 * rpm Not specified
CNA Red Hat RHEL-8 Based Middleware Containers unaffected 7.13.5-4.1777325711 * rpm Not specified
CNA Red Hat RHEL-8 Based Middleware Containers unaffected 7.13.5-4.1777325710 * rpm Not specified
CNA Red Hat RHEL-8 Based Middleware Containers unaffected 7.13.5-3.1777325680 * rpm Not specified
CNA Red Hat RHEL-8 Based Middleware Containers unaffected 7.13.5-4.1777325709 * rpm Not specified
CNA Red Hat RHEL-8 Based Middleware Containers unaffected 7.13.5-4.1777325680 * rpm Not specified
CNA Red Hat RHEL-8 Based Middleware Containers unaffected 7.13.5-4.1777325708 * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected 1778101579 * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected 1778156756 * rpm Not specified
CNA Red Hat Red Hat Hardened Images unaffected 3.8.7-1.hum1 * rpm Not specified
CNA Red Hat Red Hat Insights Proxy 1.5 unaffected 1776868961 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1776868774 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1776868744 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1776868772 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1776868842 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1777459441 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1777454300 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1777459504 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:8534 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:9832 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8521 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:11768 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:10097 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8492 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8865 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8510 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:12274 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:8873 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8866 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:14937 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:9592 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8908 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:10065 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8944 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8517 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:9026 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:8867 [email protected] access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2026:13812 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-4424 [email protected] access.redhat.com Third Party Advisory
github.com/libarchive/libarchive/pull/2898 [email protected] github.com Issue Tracking, Third Party Advisory
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com Issue Tracking, Third Party Advisory
access.redhat.com/errata/RHSA-2026:8864 [email protected] access.redhat.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Elhanan Haenel for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-19T12:22:21.740ZReported to Red Hat.
CNA2026-03-19T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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