Heap Overflow in Perl DBI Library

Executive Summary

This vulnerability affects DBI versions before 1.650 for Perl. It is a heap overflow issue that occurs when preparsing SQL statements containing an extremely large number of placeholders.

The previous fix for a related vulnerability (CVE-2026-10879) did not allocate enough memory to handle around 1.2 million placeholders, which could lead to this overflow.

DBI version 1.650 addresses this by setting a hard limit of 99,999 placeholders to prevent the overflow.

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Impact Analysis

A heap overflow vulnerability can lead to unpredictable behavior such as application crashes, data corruption, or potentially allow an attacker to execute arbitrary code.

In this case, if an attacker can supply SQL statements with an extremely large number of placeholders, it may trigger the overflow, compromising the stability or security of the application using DBI.

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Mitigation Strategies

To mitigate this vulnerability, upgrade DBI to version 1.650 or later, which sets a hard limit of 99,999 placeholders to prevent heap overflow issues.

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