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CVE-2023-28867: Preventing stack overflow exceptions via limiting the depth of the parser rules by bbakerman · Pull Request #3112 · graphql-java/graphql-java
In GraphQL Java (aka graphql-java) before 20.1, an attacker can send a crafted GraphQL query that causes stack consumption. The fixed versions are 20.1, 19.4, 18.4, 17.5, and 0.0.0-2023-03-20T01-49-44-80e3135.
This puts in a limit on how deep grammar rules can get.
As ANLTR is a recursive-descent parser it will build up a call stack as it moves along. This stack is limited and can blow up with just the wrong input. Even if the max tokens checking is in place, it can still blow the JVM stack before the max tokens are reached.
Right now it’s 500 deep as presented here. Is this the right value? More?? Less ?? I changed it from 1000
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In GraphQL Java (aka graphql-java) before 20.1, an attacker can send a crafted GraphQL query that causes stack consumption. The fixed versions are 20.1, 19.4, 18.4, 17.5, and 0.0.0-2023-03-20T01-49-44-80e3135.