CVE-2026-75507
GraphQL-core: Denial of service via quadratic complexity in the OverlappingFieldsCanBeMerged validation rule
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
GraphQL-core is a Python port of the GraphQL.js reference implementation. From 3.0.0 until 3.2.12 and 3.3.0rc1, the OverlappingFieldsCanBeMerged rule in specified_rules repeatedly compares fields that share response names and recursively re-compares flattened inline fragments during the validation phase. The prior named-fragment memoization does not cover this path, so nested repeated inline fragments can drive quadratic and worst-case O(n²·m²) CPU work before any resolver or AST-based depth or complexity control runs. An unauthenticated remote attacker can submit a shallow, highly compressible GraphQL query that pins a worker process and can saturate a multi-worker service. This issue is fixed in versions 3.2.12 and 3.3.0rc1.
Timeline
ID reserved
By GitHub_M
- 2 months later
· 2 months later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.60% · top 51% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- affected >= 3.0.0, < 3.2.12
- affected >= 3.3.0a1, < 3.3.0rc1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPIgraphql-coreGHSA-vj8h-fx38-h3vc (opens in a new tab)
References (5)
- https://github.com/graphql-python/graphql-core/security/advisories/GHSA-vj8h-fx38-h3vc (opens in a new tab)x_refsource_CONFIRM
- https://github.com/graphql-python/graphql-core/commit/150e59814d97d12140be005a558c93188ef89198 (opens in a new tab)x_refsource_MISC
- https://github.com/graphql-python/graphql-core/commit/29c2753a7ee30a96a4109e7c6add1a2dae0497d7 (opens in a new tab)x_refsource_MISC
- https://github.com/graphql-python/graphql-core/releases/tag/v3.2.12 (opens in a new tab)x_refsource_MISC
- https://github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-vj8h-fx38-h3vc (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-75507)Record last updated .