CVE-2026-75508 GraphQL-core: Denial of service via comment tokens bypassing the parser's max_tokens limit

GraphQL-core is a Python port of the GraphQL.js reference implementation. From 3.2.3 until 3.2.12 and 3.3.0rc1, the parser's maxtokens limit in Parser.advancelexer counts only non-comment tokens returned after Lexer.lookahead skips comments. Each skipped comment is still allocated as a Token and...

CVE-2026-75508

The GraphQL-core Python library (versions 3.2.3 through 3.2.12 and 3.3.0rc1 ) is vulnerable to a Denial of Service via memory exhaustion. The root cause is that the max_tokens limit in Parser.advance_lexer only counts non-comment tokens, while Lexer.lookahead() still allocates and retains Token o...

EUVD-2026-108225

GraphQL-core is a Python port of the GraphQL.js reference implementation. From 3.2.3 until 3.2.12 and 3.3.0rc1, the parser's maxtokens limit in Parser.advancelexer counts only non-comment tokens returned after Lexer.lookahead skips comments. Each skipped comment is still allocated as a Token and...