Debian Security Advisory

DLA-2471-1 libxstream-java -- LTS security update

Date Reported:
01 Dec 2020
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2020-26217.
More information:

It was found that XStream is vulnerable to Remote Code Execution. The vulnerability may allow a remote attacker to run arbitrary shell commands only by manipulating the processed input stream. Users who rely on blocklists are affected (the default in Debian). We strongly recommend to use the whitelist approach of XStream's Security Framework because there are likely more class combinations the blacklist approach may not address.

For Debian 9 stretch, this problem has been fixed in version 1.4.9-2+deb9u1.

We recommend that you upgrade your libxstream-java packages.

For the detailed security status of libxstream-java 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: