Executive Summary

This vulnerability in libexpat before version 2.7.4 occurs because the doContent function does not properly check for integer overflow when calculating the buffer size (bufSize) for tag buffer reallocation. Without this check, the buffer size calculation can overflow, potentially leading to incorrect memory allocation and related errors. [1]

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Impact Analysis

The vulnerability can lead to memory allocation errors due to integer overflow during buffer size calculation. This can cause buffer overflows or other memory safety issues, potentially allowing an attacker with local access to cause denial of service or compromise the integrity and confidentiality of data processed by libexpat. [1]

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Mitigation Strategies

To mitigate this vulnerability, update libexpat to version 2.7.4 or later where the integer overflow check for buffer reallocation in the doContent function has been implemented. This update includes a fix that prevents integer overflow by verifying buffer size before reallocation, improving memory safety. [1]

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