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Red Hat Enterprise Linux 10 CVE-2026-4111

| EUVDEUVD-2026-12031 HIGH
Loop with Unreachable Exit Condition (Infinite Loop) (CWE-835)
2026-03-13 redhat
7.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

8
Analysis Updated
Apr 20, 2026 - 04:33 vuln.today
v4 (cvss_changed)
Analysis Updated
Apr 17, 2026 - 14:29 vuln.today
v3 (cvss_changed)
Analysis Updated
Apr 17, 2026 - 12:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 16, 2026 - 14:22 vuln.today
cvss_changed
Patch released
Apr 06, 2026 - 12:45 nvd
Patch available
EUVD ID Assigned
Mar 13, 2026 - 16:57 euvd
EUVD-2026-12031
Analysis Generated
Mar 13, 2026 - 16:57 vuln.today
CVE Published
Mar 13, 2026 - 11:45 nvd
HIGH 7.5

DescriptionCVE.org

A 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.

AnalysisAI

Infinite loop in libarchive's RAR5 decompression (archive_read_data) allows remote unauthenticated denial-of-service via malformed archive that passes checksum validation. Affects Red Hat Enterprise Linux 6-10 and OpenShift Container Platform 4. EPSS 0.04% (11th percentile) suggests low exploitation probability despite CVSS 7.5. Vendor patches available from Red Hat and Ubuntu. Upstream fix in libarchive PR#2877. No active exploitation confirmed (not in CISA KEV).

Technical ContextAI

This vulnerability resides in libarchive, a widely-deployed open-source library for reading and writing streaming archives (tar, zip, RAR, etc.). The flaw (CWE-835: Loop with Unreachable Exit Condition) occurs specifically in the RAR5 format decompression state machine within archive_read_data(). The malicious archive exploits a logic flaw where internal decompression state transitions fail to advance, causing the parser to spin indefinitely while consuming CPU. The attack is particularly insidious because the archive satisfies structural and checksum validation, bypassing pre-processing detection mechanisms. Applications using libarchive for automated archive processing (package managers, backup tools, email gateways, file upload services) are vulnerable when they invoke archive_read_data() on untrusted RAR5 files. The CPE data confirms impact across Red Hat Enterprise Linux 6, 7, 8, 9, 10 and OpenShift Container Platform 4, indicating widespread deployment in enterprise Linux environments.

RemediationAI

Apply vendor-supplied patches immediately for systems processing untrusted archives. Red Hat users should install updates via the RHSA advisories listed above using 'yum update libarchive' or 'dnf update libarchive' appropriate to their RHEL version. Ubuntu users should follow guidance in USN-8147-1. Upstream fix is available in libarchive PR#2877 for organizations building from source. If patching cannot be completed immediately, implement compensating controls: (1) disable automated RAR5 archive processing in services handling untrusted input-this breaks functionality for legitimate RAR5 files but eliminates attack surface; (2) implement CPU resource limits (cgroups, ulimit) and monitoring with automatic process termination for archive extraction workers-allows detection and recovery but service remains vulnerable to repeated attacks; (3) reject RAR5 format entirely via MIME type or magic number filtering at upload/email gateway boundaries-preserves functionality for other archive formats but may impact users legitimately sending RAR5 files. Each mitigation trades functionality for security. Long-term solution requires vendor patches from Red Hat, Ubuntu, or upstream libarchive project.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-4111 vulnerability details – vuln.today

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