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libswscale/utils.c in libav 11.8 allows remote attackers to cause a denial of service (crash) via vectors involving left shift of a negative value.
Use CWE-189, Libav vendor hub and Libav product page to widen CVE-2016-9825 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2014-4609, CVE-2019-9719 and CVE-2020-18778 for nearby disclosures in the same product family.