Strawberry GraphQL's Bypass of MaxAliasesLimiter via Fragment Spreads leading to GraphQL Alias Amplification

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

• CVE-2026-47707: 0.47% estimated exploitation activity in the next 30 days; percentile 40.37 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The MaxAliasesLimiter extension in Strawberry fails to account for the multiplicative/amplification effect of FragmentSpreadNode. While it correctly counts static aliases within the AST it does not consider how many times a fragments internal aliases are expanded during execution. this allows an attacker to bypass alias limits and force the server to resolve and render a significantly higher number of aliases than allowed, potentially leading to a dos via resource exhaustion. Details The current implementation of alias counting in strawberry/extensions/maxaliases.py uses a static approach When a FragmentSpread is used multiple times, the actual number of aliases processed by the execution engine is Total Aliases = query aliases + (num of spreads aliases within fragment) Because Strawberry only performs a static sum of the text, it misses this multiplication PoC server code payloads Impact An attacker can bypass security constraints to cause Application-level DOS. By staying…

Published by the source

4 Jun 2026, 14:39 UTC

Last modified by the source

13 Jul 2026, 07:26 UTC

Source last checked

26 Oct 2026, 13:45 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-fr49-mhgj-crfc

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-fr49-mhgj-crfc

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# Patch Next advisory brief: CVE-2026-47707

Advisory: Strawberry GraphQL's Bypass of MaxAliasesLimiter via Fragment Spreads leading to GraphQL Alias Amplification
IDs: CVE-2026-47707, GHSA-fr49-mhgj-crfc
Record: https://patchnext.com/advisories/cve-2026-47707 (revision 2, source checked 26 Oct 2026, 13:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: strawberry-graphql 0.315.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI strawberry-graphql: affected >= 0.172.0, <= 0.315.6; fixed in 0.315.7

## Suggested inspection (read-only)
- `python -m pip show strawberry-graphql`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on strawberry-graphql.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-fr49-mhgj-crfc (OSV record GHSA-fr49-mhgj-crfc lists affected ranges: PyPI strawberry-graphql >=0.172.0 <0.315.7 (fixed))
- Verified: https://github.com/advisories/GHSA-fr49-mhgj-crfc (GitHub-reviewed advisory GHSA-fr49-mhgj-crfc lists affected ranges: PyPI strawberry-graphql >=0.172.0 <=0.315.6)

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