Debian Security Advisory DSA 492-1 - Steve Grubb discovered a problem in the Portable Network Graphics library libpng which is utilized in several applications. When processing a broken PNG image, the error handling routine will access memory that is out of bounds when creating an error message. Depending on machine architecture, bounds checking and other protective measures, this problem could cause the program to crash if a defective or intentionally prepared PNG image file is handled by libpng.
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