The PGP signature parsing in Module::Signature before 0.74 allows remote attackers to cause the unsigned portion of a SIGNATURE file to be treated as the signed portion via unspecified vectors.

Module::Signature before 0.74 allows remote attackers to bypass signature verification for files via a signature file that does not list the files.

Untrusted search path vulnerability in Module::Signature before 0.75 allows local users to gain privileges via a Trojan horse module under the current working directory, as demonstrated by a Trojan horse Text::Diff module.

Module::Signature before 0.74 allows remote attackers to execute arbitrary shell commands via a crafted SIGNATURE file which is not properly handled when generating checksums from a signed manifest.

The cpansign verify functionality in the Module::Signature module before 0.72 for Perl allows attackers to bypass the signature check and execute arbitrary code via a SIGNATURE file with a "special unknown cipher" that references an untrusted module in Digest/.