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[USN-8581-1] libarchive vulnerabilities

Posted on 22 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8581-1
July 21, 2026

libarchive vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in libarchive.

Software Description:
- libarchive: Library to read/write archive files

Details:

It was discovered that libarchive did not properly manage memory when
unpacking certain RAR5 archives, leading to a double free. An attacker
could possibly use this issue to cause a denial of service.
(CVE-2026-14164)

It was discovered that libarchive did not properly validate certain tar
archives, leading to a buffer overflow. A remote attacker could possibly
use this issue to cause a denial of service or execute arbitrary code.
This issue only affected Ubuntu 26.04 LTS. (CVE-2026-15028)

It was discovered that libarchive did not properly validate certain
malformed ACL entries. An attacker could possibly use this issue to cause a
denial of service. (CVE-2026-5745)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libarchive-dev 3.8.5-1ubuntu2.2
libarchive-tools 3.8.5-1ubuntu2.2
libarchive13t64 3.8.5-1ubuntu2.2

Ubuntu 24.04 LTS
libarchive-dev 3.7.2-2ubuntu0.8
libarchive-tools 3.7.2-2ubuntu0.8
libarchive13t64 3.7.2-2ubuntu0.8

Ubuntu 22.04 LTS
libarchive-dev 3.6.0-1ubuntu1.8
libarchive-tools 3.6.0-1ubuntu1.8
libarchive13 3.6.0-1ubuntu1.8

Ubuntu 20.04 LTS
libarchive-dev 3.4.0-2ubuntu1.5+esm3
Available with Ubuntu Pro
libarchive-tools 3.4.0-2ubuntu1.5+esm3
Available with Ubuntu Pro
libarchive13 3.4.0-2ubuntu1.5+esm3
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8581-1
CVE-2026-14164, CVE-2026-15028, CVE-2026-5745

Package Information:
https://launchpad.net/ubuntu/+source/libarchive/3.8.5-1ubuntu2.2
https://launchpad.net/ubuntu/+source/libarchive/3.7.2-2ubuntu0.8
https://launchpad.net/ubuntu/+source/libarchive/3.6.0-1ubuntu1.8

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