CVE-2026-4111 — Libarchive: infinite loop denial of service in rar5 decompression via archive_read_data() in libarchive

Affected: 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, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Extended Update Support, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat OpenShift Container Platform 4.13, Red Hat OpenShift Container Platform 4.14, Red Hat OpenShift Container Platform 4.15 and 14 more

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.

USN-8147-1 — libarchive vulnerabilities

Affected: Ubuntu:Pro:14.04:LTS: libarchive, Ubuntu:Pro:16.04:LTS: libarchive, Ubuntu:Pro:18.04:LTS: libarchive, Ubuntu:Pro:20.04:LTS: libarchive, Ubuntu:22.04:LTS: libarchive, Ubuntu:24.04:LTS: libarchive, Ubuntu:25.10: libarchive

It was discovered that libarchive incorrectly handled certain archive files. An attacker could possibly use this issue to access sensitive information. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-19221)

It was discovered that libarchive incorrectly handled certain RAR archive files. If a user or automated system were tricked into processing a specially crafted RAR archive, an attacker could possibly use this issue to cause libarchive to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2024-20696)

It was discovered that libarchive incorrectly handled certain RAR archive files. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2025-5914)

It was discovered that libarchive incorrectly handled certain WARC archive files. If a user or automated system were tricked into processing a specially crafted WARC archive, an attacker could possibly use this issue to cause libarchive to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2025-5916)

It was discovered that libarchive incorrectly handled certain file names when handling prefixes and suffixes. An attacker could possibly use this issue to cause libarchive to crash, resulting in a denial of service. This i…

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CVE-2026-4111 — Libarchive: infinite loop denial of service in rar5 decompression via archive_read_data() in libarchive

USN-8147-1 — libarchive vulnerabilities