Debian Security Advisory

DLA-2554-1 firejail -- LTS security update

Date Reported:
11 Feb 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-26910.
More information:

Roman Fiedler discovered a vulnerability in the OverlayFS code in firejail, a sandbox program to restrict the running environment of untrusted applications, which could result in root privilege escalation. This update disables OverlayFS support in firejail.

For Debian 9 stretch, this problem has been fixed in version

We recommend that you upgrade your firejail packages.

For the detailed security status of firejail 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: