| Package | Affected versions | Patched versions |
|---|---|---|
| squid | ≥ 3.0, ≤ 3.5.28≥ 4.0, ≤ 4.10≥ 5.0, ≤ 5.0.1 |
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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