asn1/cms/GCMParameters.java in the Bouncy Castle Crypto APIs 1.54 for Java, as used in Android 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-04-01, has an improper AES-GCM-ICVlen value, which makes it easier for attackers to defeat a cryptographic protection mechanism and discover an authentication key via a crafted application, aka internal bug 26234568.