If GnuPG processes a userid with a very long packet length, GnuPG can crash due to insufficient bounds check. This can result in a denial-of-service condition or potentially execution of arbitrary code with the privileges of the user running GnuPG.
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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Officer. Refer to "FreeBSD Security Information" for more information.