The XML parser in Mozilla Firefox before 1.5.0.1 and SeaMonkey before 1.0 allows remote attackers to cause a denial of service (crash) and possibly read sensitive data via unknown attack vectors that trigger an out-of-bounds read.
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.