[FREEBSD:EDEF3F2F-82CF-11DF-BCCE-0018F3E2EB82] png -- libpng decompression buffer overflow

The PNG project describes the problem in an advisory:

  Several versions of libpng through 1.4.2 (and through 1.2.43
    in the older series) contain a bug whereby progressive
    applications such as web browsers (or the rpng2 demo app included
    in libpng) could receive an extra row of image data beyond the
    height reported in the header, potentially leading to an
    out-of-bounds write to memory (depending on how the application
    is written) and the possibility of execution of an attacker's
    code with the privileges of the libpng user (including remote
    compromise in the case of a libpng-based browser visiting a
    hostile web site).