I have no idea when it has been released, but I've just noticed it exists in our world. No changelog, NEWS file or release notes, as usual. Reproducible: Always
+*unrar-3.9.7 (16 Dec 2009) + + 16 Dec 2009; Samuli Suominen <ssuominen@gentoo.org> +unrar-3.9.7.ebuild: + Version bump wrt #297130, thanks to Arseny Solokha for reporting.