urllib3 Change log for version 1.26.19 (Fix)

The Fix

pip install urllib3==1.26.20

Based on closed urllib3/urllib3 issue #3414 · PR/commit linked

Open PR/Commit

@@ -220,6 +220,12 @@ Fixed
 * Fixed ``urllib3.contrib.pyopenssl.WrappedSocket`` and ``urllib3.contrib.securetransport.WrappedSocket`` close methods (`#2970 <https://github.com/urllib3/urllib3/issues/2970>`__)
 
+1.26.19 (2024-06-17)
+====================
+

fix.md

Option A — Upgrade to fixed release\npip install urllib3==1.26.20\nWhen NOT to use: This fix is not applicable if the changelog is already updated.\n\n

Why This Fix Works in Production

Trigger: Change log for version 1.26.19
Mechanism: Added changelog entry for version 1.26.19 to the main changelog.
Why the fix works: Added changelog entry for version 1.26.19 to the main changelog. (first fixed release: 1.26.20).

Why This Breaks in Prod

Production symptom (often without a traceback): Change log for version 1.26.19

Proof / Evidence

GitHub issue: #3414
Fix PR: https://github.com/urllib3/urllib3/pull/3415
First fixed release: 1.26.20
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.95
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.64

Discussion

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

Jump to Sources Open on GitHub

“please add the change log for version 1.26.19”

Issue thread · issue description · source

Failure Signature (Search String)

Change log for version 1.26.19
please add the change log for version `1.26.19`

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Change log for version 1.26.19
please add the change log for version `1.26.19`

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Change log for version 1.26.19
please add the change log for version `1.26.19`

Fix Options (Details)

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

pip install urllib3==1.26.20

When NOT to use: This fix is not applicable if the changelog is already updated.

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

Fix reference: https://github.com/urllib3/urllib3/pull/3415

First fixed release: 1.26.20

Last verified: 2026-02-09. Validate in your environment.

When NOT to Use This Fix

This fix is not applicable if the changelog is already updated.

Did This Fix Work in Your Case?

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

Prevention

Add a CI check that diffs key outputs after upgrades (OpenAPI schema snapshots, JSON payload shapes, CLI output).
Upgrade behind a canary and run integration tests against the canary before 100% rollout.

Version Compatibility Table

Version	Status
1.26.20	Fixed

Related Issues

No related fixes found.

Cluster: urllib3:other urllib3 hub urllib3 best practices All hubs All clusters

Related clusters: Configuration error Data consistency SSL handshake

Sources

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