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.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0199 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:5063 advisory.

    * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive     (CVE-2026-4111)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:5080 advisory.

    * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive     (CVE-2026-4111)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 9 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2026-345:01 advisory.

    * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive     (CVE-2026-4111)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:5063 advisory.

    * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive     (CVE-2026-4111)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 9 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:5080 advisory.

    * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive     (CVE-2026-4111)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-5080 advisory.

    [3.5.3-7]
    - Resolves: CVE-2026-4111

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-5063 advisory.

    [3.7.7-5]
    - Resolves: CVE-2026-4111

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:5063 advisory.

    The libarchive programming library can create and read several different streaming archive formats,     including GNU tar, cpio, and ISO 9660 CD-ROM images. Libarchive is used notably in the bsdtar utility,     scripting language bindings such as python-libarchive, and several popular desktop file managers.

    Security Fix(es):

    * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive     (CVE-2026-4111)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:5080 advisory.

    The libarchive programming library can create and read several different streaming archive formats,     including GNU tar, cpio, and ISO 9660 CD-ROM images. Libarchive is used notably in the bsdtar utility,     scripting language bindings such as python-libarchive, and several popular desktop file managers.

    Security Fix(es):

    * libarchive: Infinite Loop Denial of Service in RAR5 Decompression via archive_read_data() in libarchive     (CVE-2026-4111)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-4111)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
304567	TencentOS Server 4: libarchive (TSSA-2026:0199)	Nessus	Tencent Local Security Checks	high
303980	RockyLinux 10 : libarchive (RLSA-2026:5063)	Nessus	Rocky Linux Local Security Checks	high
303869	RockyLinux 9 : libarchive (RLSA-2026:5080)	Nessus	Rocky Linux Local Security Checks	high
303278	MiracleLinux 9 : libarchive-3.5.3-7.el9_7 (AXSA:2026-345:01)	Nessus	Miracle Linux Local Security Checks	high
303209	AlmaLinux 10 : libarchive (ALSA-2026:5063)	Nessus	Alma Linux Local Security Checks	high
303188	AlmaLinux 9 : libarchive (ALSA-2026:5080)	Nessus	Alma Linux Local Security Checks	high
303076	Oracle Linux 9 : libarchive (ELSA-2026-5080)	Nessus	Oracle Linux Local Security Checks	high
303075	Oracle Linux 10 : libarchive (ELSA-2026-5063)	Nessus	Oracle Linux Local Security Checks	high
303040	RHEL 10 : libarchive (RHSA-2026:5063)	Nessus	Red Hat Local Security Checks	high
303038	RHEL 9 : libarchive (RHSA-2026:5080)	Nessus	Red Hat Local Security Checks	high
302158	Linux Distros Unpatched Vulnerability : CVE-2026-4111	Nessus	Misc.	high

Detections

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CVE-2026-4111

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