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gnupg2
.
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package and not the gnupg2
package as distributed by Debian
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for Debian:11
relevant fixed versions and status.
In GnuPG before 2.5.5, if a user chooses to import a certificate with certain crafted subkey data that lacks a valid backsig or that has incorrect usage flags, the user loses the ability to verify signatures made from certain other signing keys, aka a "verification DoS."