Public bug reported:

the backport to urllib3 1.26.5  is a copy and paste of code from urllib3
2.x that makes no sense in urllib3 1.x

There is no tracking of decoded response data in urllib3 1.x
`HTTPResponse` class. Using the API from 2.x `BaseHTTPResponse` class in
1.x `HTTPResponse` class does not make sense in this case.

As a result, accessing the `self._has_decoded_data` property which only
exists in 2.x new `BaseHTTPResponse` is not valid in 1.x `HTTPResponse`
and any code that uses response streaming in Jammy will fail.

** Affects: python-urllib3 (Ubuntu)
     Importance: Undecided
         Status: New

** CVE added: https://cve.org/CVERecord?id=CVE-2026-21441

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https://bugs.launchpad.net/bugs/2138420

Title:
  backport of CVE-2026-21441 results in broken package

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