Kmail 1.9.1 on KDE 3.5.2, with "Prefer HTML to Plain Text" enabled, allows remote attackers to cause a denial of service (crash) via an HTML e-mail with certain table and frameset tags that trigger a segmentation fault, possibly involving invalid free or delete operations.
Improper Input Validation 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.