CVE-2019-12519

CRITICAL Year: 2019
CVSS v3 Score
9.8
Critical
CVSS v2 Score
7.5
High
Weakness Type
CWE-787
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Vulnerability Description

An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.

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