Answer in brief
CVE-2026-75507 records a High severity (CVSS 7.5) vulnerability in GraphQL-core: Denial of service via quadratic complexity in the OverlappingFieldsCanBeMerged validation rule. The current sources do not mark it as known exploited. The current feed maps graphql-python/graphql-core (generic), graphql-core (pip), graphql-core (pip). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps graphql-python/graphql-core (generic), graphql-core (pip), graphql-core (pip). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| graphql-python/graphql-coregeneric | >=3.0.0 <3.2.12 || >=3.3.0a1 <3.3.0rc1 | 3.2.12, 3.3.0rc1 |
| graphql-corepip | >=3.0.0,<3.2.12 | 3.2.12 |
| graphql-corepip | >=3.3.0a1,<3.3.0rc1 | 3.3.0rc1 |
Published upstream
Oct 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.