libgdata before 0.10.2 and 0.11.x before 0.11.1 does not validate SSL certificates, which allows remote attackers to obtain user names and passwords via a man-in-the-middle (MITM) attack with a spoofed certificate.
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.