GraphQL-core: Denial of service via comment tokens bypassing the parser's max_tokens limit

影響: pip:graphql-core >= 3.2.3, < 3.2.12 → 3.2.12, pip:graphql-core >= 3.3.0a3, < 3.3.0rc1 → 3.3.0rc1

The parser's max_tokens limit — the documented defence against oversized GraphQL documents — did not count comment tokens. A document padded with comments could therefore pass a max_tokens check of any size while still allocating one Token object per comment, all of which stay reachable for the lifetime of the parsed document. A 38 MB comment-padded payload allocated roughly 92 MB of additional resident memory with max_tokens=5 in force. Details Lexer.lookahead() reads tokens one at a time and…

Read on GitHub Advisory Database

On 10/23/2026, 01:27 AM, GitHub Advisory Database published "GraphQL-core: Denial of service via comment tokens bypassing the parser's max_tokens limit" (type: Advisory). Severity is "High" (high). Related technologies: Python. CVE: CVE-2026-75508.