RPM before 4.9.1.3 does not properly validate region tags, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an invalid region tag in a package header to the (1) headerLoad, (2) rpmReadSignature, or (3) headerVerify function.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.