7.5
HighCVSS 3.1 · from GitHub_M
CVE-2026-75507
GraphQL-core: Denial of service via quadratic complexity in the OverlappingFieldsCanBeMerged validation rule
graphql-core · Uncontrolled resource use · CWE-400Affectedgraphql-core
FixNo fix listed yet.
PublishedOct 22, 16:12 · 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 3.0.0 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.
From GitHub_M
Affected and fixed versions
ProductAffectedFixed ingraphql-core>= 3.0.0, < 3.2.12–graphql-core>= 3.3.0a1, < 3.3.0rc1–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known