Debian Security Advisory

DLA-2629-1 libebml -- LTS security update

Date Reported:
18 Apr 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-3405.
More information:

A heap overflow issue was detected in libebml, a library to read and write files in the EBML format, a binary pendant to XML. These issues appeared in several ReadData functions of various data type classes. This update also fixes the issue in EbmlString::ReadData and EbmlUnicodeString::ReadData, which were mentioned in CVE-2021-3405.

For Debian 9 stretch, this problem has been fixed in version 1.3.4-1+deb9u2.

We recommend that you upgrade your libebml packages.

For the detailed security status of libebml 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: