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Test your applicationsUpgrade Debian:11 gdk-pixbuf to version 0.22.0-7 or higher.
Note: Versions mentioned in the description apply only to the upstream gdk-pixbuf package and not the gdk-pixbuf package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
The BMP image processor for (1) gdk-pixbuf before 0.22 and (2) gtk2 before 2.2.4 allows remote attackers to cause a denial of service (infinite loop) via a crafted BMP file.