EUVD-2026-12031CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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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.
Analysis
A remote code execution vulnerability in A flaw (CVSS 7.5). High severity vulnerability requiring prompt remediation.
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Remediation
Within 24 hours: Inventory all systems running affected RHEL versions 6–10 and OCP 4, particularly those with network-accessible archive processing capabilities. Within 7 days: Implement compensating controls (input validation, network segmentation, resource limits) and disable RAR5 decompression if not business-critical. …
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