It was discovered that there was a series of denial of service vulnerabilities in Pygments, a popular syntax highlighting library for Python.
A number of regular expressions had exponential or cubic worst-case complexity which could cause a remote denial of service (DoS) when provided with malicious input.
For Debian 8 Jessie, these problems have been fixed in version 2.0.1+dfsg-1.1+deb8u3.
We recommend that you upgrade your pygments packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/