Debian Security Advisory

DSA-4905-1 shibboleth-sp -- security update

Date Reported:
27 Apr 2021
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 987608.
In Mitre's CVE dictionary: CVE-2021-31826.
More information:

It was discovered that the Shibboleth Service Provider is prone to a NULL pointer dereference flaw in the cookie-based session recovery feature. A remote, unauthenticated attacker can take advantage of this flaw to cause a denial of service (crash in the shibd daemon/service).

For additional information please refer to the upstream advisory at

For the stable distribution (buster), this problem has been fixed in version 3.0.4+dfsg1-1+deb10u2.

We recommend that you upgrade your shibboleth-sp packages.

For the detailed security status of shibboleth-sp please refer to its security tracker page at: