CVE-2026-75508
CVE-2026-75508
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- github.com/graphql-python/graphql-core/security/advisories/GHSA-r77w-qph3-7vf8
- github.com/graphql-python/graphql-core/commit/437dea102e92fdf05a2971ca76787c5a5…
- github.com/graphql-python/graphql-core/commit/80ef435a1808fbbcc4aaac63ae76771a1…
- github.com/graphql-python/graphql-core/releases/tag/v3.2.12
- github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1
Frequently asked questions
- What is CVE-2026-75508?
- CVE-2026-75508 is a high-severity vulnerability, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-10-22.
- How severe is CVE-2026-75508?
- High severity. CVSS v3 base score is 7.5 out of 10.