CVE-2022-22823

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This is an important rather than a critical vulnerability due to its practical limitations. The flaw arises from unsafe left-shift operations in storeAtts() within libexpat, which, under extreme conditions (e.g., over 2²⁹ prefixed attributes), can lead to undefined behavior, memory mismanagement, and denial-of-service (DoS). However, exploitation requires specially crafted XML payloads several gigabytes in size (~6.5 GiB), which makes remote exploitation unlikely in real-world environments due to common upload limits and resource constraints. There is no evidence of arbitrary code execution, memory corruption leading to privilege escalation, or data leaks.