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CVE-2026-4111

HIGHCVSS 7.5/10EPSS 0.69%

Last modified

CVE-2026-4111 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
0.69%

48.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
Red HatRed Hat Enterprise Linux 10All versions
Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportAll versions
Red HatRed Hat Enterprise Linux 9All versions
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP SolutionsAll versions
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP SolutionsAll versions
Red HatRed Hat Enterprise Linux 9.4 Extended Update SupportAll versions
Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportAll versions
Red HatRed Hat OpenShift Container Platform 4.13All versions
Red HatRed Hat OpenShift Container Platform 4.14All versions
Red HatRed Hat OpenShift Container Platform 4.15All versions
Red HatRed Hat OpenShift Container Platform 4.16All versions
Red HatRed Hat OpenShift Container Platform 4.17All versions
Red HatRed Hat OpenShift Container Platform 4.18All versions
Red HatRed Hat OpenShift Container Platform 4.19All versions
Red HatRed Hat AI Inference Server 3.2All versions
Red HatRed Hat AI Inference Server 3.3All versions
Red HatRed Hat Discovery 2All versions
Red HatRed Hat Hardened ImagesAll versions
Red HatRed Hat Insights proxy 1.5All versions
Red HatRed Hat Update Infrastructure 5All versions
Red HatRed Hat Enterprise Linux 6All versions

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-4111?
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.
How severe is CVE-2026-4111?
CVE-2026-4111 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.
How do I fix CVE-2026-4111?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST