7.5
HighCVSS 3.1 · from GitHub_M
CVE-2026-75508
GraphQL-core: Denial of service via comment tokens bypassing the parser's max_tokens limit
graphql-core · Uncontrolled resource use · CWE-400Affectedgraphql-core
FixNo fix listed yet.
PublishedOct 22, 16:10 · GitHub_M
ScoredOct 22 · 7.5 · GitHub_M
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:08 UTC
What we know
No known exploitation. CISA KEV, checked 22:08 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
A successful attack can take the service down. CVSS impact.
Description
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 max_tokens limit in Parser.advance_lexer counts only non-comment tokens returned after Lexer.lookahead skips comments. Each skipped comment is still allocated as a Token and retained through token.next and token.prev, allowing a highly compressible comment-padded GraphQL document to pass a low token limit while consuming memory. An unauthenticated remote attacker can exhaust worker memory before AST-based depth or complexity controls run. This issue is fixed in versions 3.2.12 and 3.3.0rc1.
From GitHub_M
Affected and fixed versions
ProductAffectedFixed ingraphql-core>= 3.2.3, < 3.2.12–graphql-core>= 3.3.0a3, < 3.3.0rc1–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known