A vulnerability in libpng can result in denial of service conditions when a remote attacker tricks a victim to open a specially-crafted PNG file.
The PNG project describes the problem in an advisory:
Because of the efficient compression method used in Portable Network Graphics (PNG) files, a small PNG file can expand tremendously, acting as a "decompression bomb".
Malformed PNG chunks can consume a large amount of CPU and wall-clock time and large amounts of memory, up to all memory available on a system
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