Debian Security Advisory

DLA-2789-1 squashfs-tools -- LTS security update

Date Reported:
20 Oct 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-41072.
More information:

Richard Weinberger reported that unsquashfs in squashfs-tools, the tools to create and extract Squashfs filesystems, does not check for duplicate filenames within a directory. An attacker can take advantage of this flaw for writing to arbitrary files to the filesystem if a malformed Squashfs image is processed.

For Debian 9 stretch, this problem has been fixed in version 1:4.3-3+deb9u3.

We recommend that you upgrade your squashfs-tools packages.

For the detailed security status of squashfs-tools please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: