Debian Security Advisory

DLA-767-1 curl -- LTS security update

Date Reported:
29 Dec 2016
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 848958.
In Mitre's CVE dictionary: CVE-2016-9586.
More information:

It was discovered that libcurl's implementation of the printf() functions triggers a buffer overflow when doing a large floating point output. The bug occurs when the conversion outputs more than 255 bytes.

The flaw happens because the floating point conversion is using system functions without the correct boundary checks.

If there are any application that accepts a format string from the outside without necessary input filtering, it could allow remote attacks.

This flaw does not exist in the command line tool.

For Debian 7 Wheezy, these problems have been fixed in version 7.26.0-1+wheezy18.

We recommend that you upgrade your curl packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: