Denial-of-Service Vulnerability in RAR5 Archive Handling of Libarchive
CVE-2026-4111

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions
Vendor
CVE Published:
13 March 2026

What is CVE-2026-4111?

A vulnerability in the RAR5 archive decompression logic of the libarchive library allows attackers to exploit a flaw in the archive_read_data() processing path. This issue arises when a specially crafted RAR5 archive is processed, causing the decompression routine to enter an infinite loop, leading to excessive CPU resource consumption. Since the affected archives pass checksum validation, applications may be unable to detect the flaw, resulting in service disruptions for processes that automatically handle archive files.

Affected Version(s)

Cert Manager support for Red Hat OpenShift release 1.18 1791459707

Cert Manager support for Red Hat OpenShift release 1.18 1791459711

Cert Manager support for Red Hat OpenShift release 1.18 1791459759

References

https://access.redhat.com/errata/RHSA-2026:10065
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10081
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10097
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Elhanan Haenel for reporting this issue.
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