Ubuntu 26.04 LTS libarchive Critical Memory Disclosure DoS Alert

ubuntu

May 21, 2026

Several security issues were fixed in libarchive.

Summary

Several security issues were fixed in libarchive.

Software Description:

- libarchive: Library to read/write archive files

Details:

It was discovered that libarchive incorrectly handled certain RAR

archives. An attacker could possibly use this issue to cause an

out-of-bounds read via a crafted RAR archive, leading to sensitive

memory disclosure. (CVE-2026-4424)

It was discovered that libarchive incorrectly handled certain ISO files.

An attacker could possibly use this issue to cause incorrect memory

allocation via a crafted ISO file, leading to a denial of service.

(CVE-2026-4426)

It was discovered that libarchive incorrectly handled block pointer

allocation in zisofs on 32-bit systems. An attacker could possibly use

this issue to cause a heap buffer overflow via a crafted ISO9660 image,

possibly leading to arbitrary code execution. (CVE-2026-5121)

Topics Covered

security advisory denial of service Ubuntu important memory disclosure libarchive

Update Instructions

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

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

Ubuntu 25.10
  libarchive-dev                  3.7.7-0ubuntu3.2
  libarchive-tools                3.7.7-0ubuntu3.2
  libarchive13t64                 3.7.7-0ubuntu3.2

Ubuntu 24.04 LTS
  libarchive-dev                  3.7.2-2ubuntu0.7
  libarchive-tools                3.7.2-2ubuntu0.7
  libarchive13t64                 3.7.2-2ubuntu0.7

Ubuntu 22.04 LTS
  libarchive-dev                  3.6.0-1ubuntu1.7
  libarchive-tools                3.6.0-1ubuntu1.7
  libarchive13                    3.6.0-1ubuntu1.7

Ubuntu 20.04 LTS
  libarchive-dev                  3.4.0-2ubuntu1.5+esm2
                                  Available with Ubuntu Pro
  libarchive-tools                3.4.0-2ubuntu1.5+esm2
                                  Available with Ubuntu Pro
  libarchive13                    3.4.0-2ubuntu1.5+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  bsdcpio                         3.2.2-3.1ubuntu0.7+esm3
                                  Available with Ubuntu Pro
  bsdtar                          3.2.2-3.1ubuntu0.7+esm3
                                  Available with Ubuntu Pro
  libarchive-dev                  3.2.2-3.1ubuntu0.7+esm3
                                  Available with Ubuntu Pro
  libarchive-tools                3.2.2-3.1ubuntu0.7+esm3
                                  Available with Ubuntu Pro
  libarchive13                    3.2.2-3.1ubuntu0.7+esm3
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  bsdcpio                         3.1.2-11ubuntu0.16.04.8+esm3
                                  Available with Ubuntu Pro
  bsdtar                          3.1.2-11ubuntu0.16.04.8+esm3
                                  Available with Ubuntu Pro
  libarchive-dev                  3.1.2-11ubuntu0.16.04.8+esm3
                                  Available with Ubuntu Pro
  libarchive13                    3.1.2-11ubuntu0.16.04.8+esm3
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  bsdcpio                         3.1.2-7ubuntu2.8+esm5
                                  Available with Ubuntu Pro
  bsdtar                          3.1.2-7ubuntu2.8+esm5
                                  Available with Ubuntu Pro
  libarchive-dev                  3.1.2-7ubuntu2.8+esm5
                                  Available with Ubuntu Pro
  libarchive13                    3.1.2-7ubuntu2.8+esm5
                                  Available with Ubuntu Pro

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