urllib3 [CI] Switch to the new codecov uploader (Fix)

The Fix

pip install urllib3==1.26.8

Based on closed urllib3/urllib3 issue #2459 · 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%.

Open PR/Commit

@@ -92,6 +92,10 @@ jobs:
 
       - name: Upload Coverage
-        run: ./ci/upload_coverage.sh
-        env:
-          JOB_NAME: "${{ runner.os }} (${{ matrix.python-version }})"

fix.md

Option A — Upgrade to fixed release\npip install urllib3==1.26.8\nWhen NOT to use: This fix is not applicable if the project does not use Codecov for coverage reporting.\n\n

Why This Fix Works in Production

Trigger: Here's the file that needs to change: https://github.com/urllib3/urllib3/blob/main/ci/upload_coverage.sh (we'll also have to backport this to 1.26.x)
Mechanism: The Bash uploader for Codecov is deprecated and will stop functioning soon
Why the fix works: Updated the CI configuration to use the new Codecov GitHub action for uploading coverage, replacing the deprecated Bash uploader. (first fixed release: 1.26.8).

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

The Bash uploader for Codecov is deprecated and will stop functioning soon
Production symptom (often without a traceback): Here's the file that needs to change: https://github.com/urllib3/urllib3/blob/main/ci/upload_coverage.sh (we'll also have to backport this to 1.26.x)

Proof / Evidence

GitHub issue: #2459
Fix PR: https://github.com/urllib3/urllib3/pull/2468
First fixed release: 1.26.8
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.75
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.77

Discussion

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

Jump to Sources Open on GitHub

“I am a little away due to festive season, if anyone want to take it up please do, else will try to raise a PR…”

@imkaka · 2021-10-18 · source

“Please go ahead :) You don't need permission to work on it, declaring intent (as @imkaka did) is enough, and even that is not mandatory”

@pquentin · 2021-10-20 · source

“Closed in https://github.com/urllib3/urllib3/pull/2468 and https://github.com/urllib3/urllib3/pull/2469, thanks @RatanShreshtha!”

@sethmlarson · 2021-10-26 · source

Failure Signature (Search String)

Here's the file that needs to change: https://github.com/urllib3/urllib3/blob/main/ci/upload_coverage.sh (we'll also have to backport this to 1.26.x)

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Here's the file that needs to change: https://github.com/urllib3/urllib3/blob/main/ci/upload_coverage.sh (we'll also have to backport this to 1.26.x)

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Here's the file that needs to change: https://github.com/urllib3/urllib3/blob/main/ci/upload_coverage.sh (we'll also have to backport this to 1.26.x)

What Broke

Coverage uploads may fail, leading to incomplete CI reports and potential delays.

Why It Broke

The Bash uploader for Codecov is deprecated and will stop functioning soon

Fix Options (Details)

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

pip install urllib3==1.26.8

When NOT to use: This fix is not applicable if the project does not use Codecov for coverage reporting.

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/2468

First fixed release: 1.26.8

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

When NOT to Use This Fix

This fix is not applicable if the project does not use Codecov for coverage reporting.

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
1.26.8	Fixed

Related Issues

No related fixes found.

Cluster: urllib3:configuration-error urllib3 hub urllib3 best practices All hubs All clusters

Related clusters: Data consistency SSL handshake Other

Sources

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