It is suspected that this package is vulnerable to a security vulnerability in gnulib. As such we ask maintainers with packages suspected to be vulnerable to verify if the package is (or have been) affected. Please see the information contained in the tracker bug 600518. "If an application using parse_datetime(), such as touch or date, accepted untrusted input, it could cause the application to crash or, potentially, execute arbitrary code."
I only checked 3.3.x branch. Fixed via https://gitlab.com/gnutls/gnutls/commit/9c1a48b7aa071377f3295801173559e5c44caa42 which is included since 3.3.0.