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An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files. The vulnerability is caused by insufficient validation of external-variable pointers, which may lead to invalid free in yrrulesdestroy() or wild pointer access in yrobjectcreate(). An attacker can provide a specially crafted .yrc file that causes memory corruption and application crash.
A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule files. An attacker can provide a malicious file with an invalid arena configuration (numbuffers=0) that triggers an assertion failure in yrarenagetptr(), causing the application to terminate.