The Fix
pip install celery==5.6.0
Based on closed celery/celery issue #8505 · PR/commit linked
Production note: This usually shows up under retries/timeouts. Treat it as a side-effect risk until you can verify behavior with a canary + real traffic.
@@ -5,9 +5,11 @@
from urllib.parse import unquote
+from kombu.utils import symbol_by_name
from kombu.utils.functional import retry_over_time
from kombu.utils.objects import cached_property
Option A — Upgrade to fixed release\npip install celery==5.6.0\nWhen NOT to use: This fix should not be used if the application does not require advanced credential management.\n\n
Why This Fix Works in Production
- Trigger: - [x] I have included all related issues and possible duplicate issues
- Mechanism: The Redis backend lacked support for a credential_provider option for advanced authentication
- Why the fix works: Adds support for the credential_provider option in the Redis backend, allowing advanced authentication configurations. (first fixed release: 5.6.0).
Why This Breaks in Prod
- The Redis backend lacked support for a credential_provider option for advanced authentication
- Production symptom (often without a traceback): - [x] I have included all related issues and possible duplicate issues
Proof / Evidence
- GitHub issue: #8505
- Fix PR: https://github.com/celery/celery/pull/9879
- First fixed release: 5.6.0
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.85
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.76
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“@auvipy I would be happy to implement this.”
“> @auvipy I would be happy to implement this. Feel free to come with a draft implementation and ping me for review/ direction etc”
“@auvipy thank you. After a quick glance I figured out that: 1. it easy to add this option for the backend (result) connection 2. the…”
“Hello, I’m attempting to use this new feature, but an issue is occurring at the Kombu layer. I’ve added all the details below: * Celery…”
Failure Signature (Search String)
- - [x] I have included all related issues and possible duplicate issues
- or possible duplicates to this issue as requested by the checklist above.
Copy-friendly signature
Failure Signature
-----------------
- [x] I have included all related issues and possible duplicate issues
or possible duplicates to this issue as requested by the checklist above.
Error Message
Signature-only (no traceback captured)
Error Message
-------------
- [x] I have included all related issues and possible duplicate issues
or possible duplicates to this issue as requested by the checklist above.
What Broke
Users were unable to implement advanced authentication configurations for Redis connections.
Why It Broke
The Redis backend lacked support for a credential_provider option for advanced authentication
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
pip install celery==5.6.0
Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.
Fix reference: https://github.com/celery/celery/pull/9879
First fixed release: 5.6.0
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- This fix should not be used if the application does not require advanced credential management.
Did This Fix Work in Your Case?
Quick signal helps us prioritize which fixes to verify and improve.
Prevention
- Capture the exact failing error string in logs and tests so you can reproduce via a minimal script.
- Pin production dependencies and upgrade only with a reproducible test that hits the failing path.
Version Compatibility Table
| Version | Status |
|---|---|
| 5.6.0 | Fixed |
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.