redis-py WRONGPASS response doesn't raise

The Fix

pip install redis==7.1.0

Based on closed redis/redis-py issue #2325 · PR/commit linked

Production note: Most teams hit this during upgrades or environment changes. Roll out with a canary and smoke critical endpoints (health, OpenAPI/docs) before 100%.

Jump to Verify Open PR/Commit

@@ -87,6 +87,15 @@ class _Sentinel(enum.Enum):
     "types, can't unload"
 )
+# user send an AUTH cmd to a server without authorization configured
+NO_AUTH_SET_ERROR = {
+    # Redis >= 6.0

repro.py

if __name__ == '__main__':
    redis = RedisClient(
        host="localhost",
        port=6379,
        socket_timeout=REDIS_SOCKET_TIMEOUT_SECONDS,
        retry_on_timeout=True,
        username="admin",
        # actual password is different
        password="random"
    )

    try:
        val = redis.get("test")
    except AuthenticationError as e:
        print("I can't reach that code")
        val = 0

    print(val)

verify

Re-run the minimal reproduction on your broken version, then apply the fix and re-run.

fix.md

Option A — Upgrade to fixed release\npip install redis==7.1.0\nWhen NOT to use: Do not apply this fix if using Redis versions older than 6.0.\n\n

Why This Fix Works in Production

Trigger: WRONGPASS response doesn't raise AuthenticationError exception
Mechanism: The WRONGPASS response raises a ResponseError instead of an AuthenticationError due to unhandled exceptions
Why the fix works: Addresses the issue where the WRONGPASS response does not raise an AuthenticationError exception. (first fixed release: 7.1.0).

Production impact:

If left unfixed, the same config can fail only in production (env differences), causing startup failures or partial feature outages.

Why This Breaks in Prod

Shows up under Python 3.5.1 in real deployments (not just unit tests).
The WRONGPASS response raises a ResponseError instead of an AuthenticationError due to unhandled exceptions
Surfaces as: WRONGPASS response doesn't raise AuthenticationError exception

Proof / Evidence

GitHub issue: #2325
Fix PR: https://github.com/redis/redis-py/pull/2329
First fixed release: 7.1.0
Reproduced locally: No (not executed)
Last verified: 2026-02-07
Confidence: 0.85
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.65

Discussion

High-signal excerpts from the issue thread (symptoms, repros, edge-cases).

Jump to Sources Open on GitHub

“**Version**: What redis-py and what redis version is the issue happening on? redis-py 4.3.4 redis 6.3.6 **Platform**: What platform / version? (For example Python 3.5.1 on Windows 7 / Ubuntu 15.10 / Azure) python 3.9 on macOS Monterey 12.0.”

Issue thread · issue description · source

Failure Signature (Search String)

WRONGPASS response doesn't raise AuthenticationError exception

Error Message

Stack trace

error.txt

Error Message
-------------
WRONGPASS response doesn't raise AuthenticationError exception

Minimal Reproduction

repro.py

if __name__ == '__main__':
    redis = RedisClient(
        host="localhost",
        port=6379,
        socket_timeout=REDIS_SOCKET_TIMEOUT_SECONDS,
        retry_on_timeout=True,
        username="admin",
        # actual password is different
        password="random"
    )

    try:
        val = redis.get("test")
    except AuthenticationError as e:
        print("I can't reach that code")
        val = 0

    print(val)

Environment

Python: 3.5.1

What Broke

Users experience incorrect authentication handling leading to unexpected application behavior.

Why It Broke

The WRONGPASS response raises a ResponseError instead of an AuthenticationError due to unhandled exceptions

Fix Options (Details)

Option A — Upgrade to fixed release Safe default (recommended)

pip install redis==7.1.0

When NOT to use: Do not apply this fix if using Redis versions older than 6.0.

Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.

Fix reference: https://github.com/redis/redis-py/pull/2329

First fixed release: 7.1.0

Last verified: 2026-02-07. Validate in your environment.

When NOT to Use This Fix

Do not apply this fix if using Redis versions older than 6.0.

Verify Fix

verify

Re-run the minimal reproduction on your broken version, then apply the fix and re-run.

Did This Fix Work in Your Case?

Quick signal helps us prioritize which fixes to verify and improve.

Prevention

Make timeouts explicit and test them (unit + integration) to avoid silent behavior changes.
Instrument retries (attempt count + reason) and alert on spikes to catch dependency slowdowns.

Version Compatibility Table

Version	Status
7.1.0	Fixed

Related Issues

No related fixes found.

Cluster: redis-py:configuration-error redis-py hub redis-py best practices All hubs All clusters

Related clusters: Retry storm Data consistency Race condition

Sources

We don’t republish the full GitHub discussion text. Use the links above for context.

redis-py WRONGPASS response doesn't raise AuthenticationError exception (Fix)