A double free issue has been identified in libarchive's RAR5 reader. During parsing of a specially crafted RAR5 archive, the filtered_buf pointer may remain stale after being freed during unpacking state reinitialization. Subsequent processing of another archive entry can trigger a second free of the same memory region, resulting in a double-free condition. Successful exploitation may cause applications using the vulnerable libarchive API to terminate unexpectedly, leading to a denial of service.

Security Update for Libarchive

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:56954 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: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in     init_unpack() (CVE-2026-14164)

    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 AlmaLinux 10 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:52675 advisory.

    * libarchive: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in     init_unpack() (CVE-2026-14164)

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-2026-52674 advisory.

    - Related: CVE-2026-14164

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 RockyLinux 10 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:52675 advisory.

    * libarchive: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in     init_unpack() (CVE-2026-14164)

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-2026:52674 advisory.

    * libarchive: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in     init_unpack() (CVE-2026-14164)

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 Oracle Linux 10 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-52675 advisory.

    - Related: CVE-2026-14164

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-2026:52675 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: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in     init_unpack() (CVE-2026-14164)

    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-2026:52674 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: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in     init_unpack() (CVE-2026-14164)

    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 double free issue has been identified in libarchive's RAR5 reader. During parsing of a specially crafted     RAR5 archive, the filtered_buf pointer may remain stale after being freed during unpacking state     reinitialization. Subsequent processing of another archive entry can trigger a second free of the same     memory region, resulting in a double-free condition. Successful exploitation may cause applications using     the vulnerable libarchive API to terminate unexpectedly, leading to a denial of service. (CVE-2026-14164)

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

ID	Name	Product	Family	Type	Severity
338064	RHEL 10 : libarchive (RHSA-2026:56954)	Nessus	Red Hat Local Security Checks	Local	high
334869	AlmaLinux 10 : libarchive (ALSA-2026:52675)	Nessus	Alma Linux Local Security Checks	Local	high
334555	Oracle Linux 9 : libarchive (ELSA-2026-52674)	Nessus	Oracle Linux Local Security Checks	Local	high
334537	RockyLinux 10 : libarchive (RLSA-2026:52675)	Nessus	Rocky Linux Local Security Checks	Local	high
334481	RockyLinux 9 : libarchive (RLSA-2026:52674)	Nessus	Rocky Linux Local Security Checks	Local	high
334428	Oracle Linux 10 : libarchive (ELSA-2026-52675)	Nessus	Oracle Linux Local Security Checks	Local	high
333597	RHEL 10 : libarchive (RHSA-2026:52675)	Nessus	Red Hat Local Security Checks	Local	high
333595	RHEL 9 : libarchive (RHSA-2026:52674)	Nessus	Red Hat Local Security Checks	Local	high
323993	Linux Distros Unpatched Vulnerability : CVE-2026-14164	Nessus	Misc.	Local	high

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