Libarchive: infinite loop denial of service in rar5 decompression via archive_read_data() in libarchive

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Summary

CVECVE-2026-4111
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-13 19:55:13 UTC
Updated2026-04-20 04:16:45 UTC
DescriptionA flaw was identified in the RAR5 archive decompression logic of the libarchive library, specifically within the archive_read_data() processing path. When a specially crafted RAR5 archive is processed, the decompression routine may enter a state where internal logic prevents forward progress. This condition results in an infinite loop that continuously consumes CPU resources. Because the archive passes checksum validation and appears structurally valid, affected applications cannot detect the issue before processing. This can allow attackers to cause persistent denial-of-service conditions in services that automatically process archives.

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:N/I:N/A:H

EPSS: 0.000340000 probability, percentile 0.096550000 (date 2026-04-19)

Problem Types: CWE-835 | CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.7.7-5.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 9 unaffected 0:3.5.3-7.el9_7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.5.3-7.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_0.3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:3.5.3-5.el9_2.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:3.5.3-4.el9_4.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:3.5.3-6.el9_6.1 * rpm Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4.13 unaffected 413.92.202604080111-0 * rpm Not specified
CNA Red Hat Red Hat AI Inference Server 3.2 unaffected sha256:54616c9f3e4d27120504b0b2020432ef3ff85286a50de7be842f05df0cfcd69e * rpm Not specified
CNA Red Hat Red Hat AI Inference Server 3.3 unaffected sha256:0ec114881d9dcd28a5dbbb2ec0ea1301ad87d5ae133121ce8167ef29d19802cc * rpm Not specified
CNA Red Hat Red Hat AI Inference Server 3.3 unaffected sha256:813ba7ccd1696b44deb90d9e6cd8af114bdb47781eae7f27246a81fba062a892 * rpm Not specified
CNA Red Hat Red Hat AI Inference Server 3.3 unaffected sha256:be6d568f28044533e4ad80f0856407c359e2eaf31a6b89cada433e6575d2300e * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected sha256:040dadd657afdb9f0914f896a4962fd3dbf40b70c8037e4d72b6801b766c9b7d * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected sha256:062310de4b34e278f8c7e4634def673a77d1228d493541ef1264ba4cb83b68eb * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Hardened Images Not specified Not specified

References

ReferenceSourceLinkTags
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/security/cve/CVE-2026-4111 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:8747 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:8865 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:6647 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:7106 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:7105 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:7329 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:8748 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:5080 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:5063 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:7335 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:7093 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:8746 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:7239 [email protected] access.redhat.com
github.com/libarchive/libarchive/pull/2877 [email protected] github.com
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
CNA2026-03-11T11:18:51.609ZReported to Red Hat.
CNA2026-03-11T00:00:00.000ZMade public.

Workarounds

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

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