The last update of tkdiff contained a programming error which is fixed by this version. For completeness we're adding the original advisory text:
Javier Fernández-Sanguino Peña from the Debian Security Audit project discovered that tkdiff, a graphical side by side "diff" utility, creates temporary files in an insecure fashion.
For the old stable distribution (woody) this problem has been fixed in version 3.08-3woody1.
For the stable distribution (sarge) this problem has been fixed in version 4.0.2-1sarge1.
For the unstable distribution (sid) this problem has been fixed in version 4.0.2-4.
We recommend that you upgrade your tkdiff package.
MD5 checksums of the listed files are available in the original advisory.
MD5 checksums of the listed files are available in the revised advisory.