This update for netpbm fixes the following issues:
Security bugs:
CVE-2017-2586: A NULL pointer dereference in stringToUint function could lead to a denial of service (abort) problem when processing malformed images. [bsc#1024292]
CVE-2017-2581: A out-of-bounds write in writeRasterPbm() could be used by attackers to crash the decoder or potentially execute code. [bsc#1024287]
CVE-2017-2587: A insufficient size check of memory allocation in createCanvas() function could be used for a denial of service attack (memory exhaustion) [bsc#1024294]