Your message dated Fri, 06 Feb 2026 01:05:07 +0000
with message-id <[email protected]>
and subject line Bug#1122029: fixed in python-urllib3 2.6.3-1
has caused the Debian Bug report #1122029,
regarding python-urllib3: CVE-2025-66471
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1122029: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1122029
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Source: python-urllib3
Version: 2.5.0-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi,
The following vulnerability was published for python-urllib3.
CVE-2025-66471[0]:
| urllib3 is a user-friendly HTTP client library for Python. Starting
| in version 1.0 and prior to 2.6.0, the Streaming API improperly
| handles highly compressed data. urllib3's streaming API is designed
| for the efficient handling of large HTTP responses by reading the
| content in chunks, rather than loading the entire response body into
| memory at once. When streaming a compressed response, urllib3 can
| perform decoding or decompression based on the HTTP Content-Encoding
| header (e.g., gzip, deflate, br, or zstd). The library must read
| compressed data from the network and decompress it until the
| requested chunk size is met. Any resulting decompressed data that
| exceeds the requested amount is held in an internal buffer for the
| next read operation. The decompression logic could cause urllib3 to
| fully decode a small amount of highly compressed data in a single
| operation. This can result in excessive resource consumption (high
| CPU usage and massive memory allocation for the decompressed data.
If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.
For further information see:
[0] https://security-tracker.debian.org/tracker/CVE-2025-66471
https://www.cve.org/CVERecord?id=CVE-2025-66471
[1] https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37
Please adjust the affected versions in the BTS as needed.
Regards,
Salvatore
--- End Message ---
--- Begin Message ---
Source: python-urllib3
Source-Version: 2.6.3-1
Done: Colin Watson <[email protected]>
We believe that the bug you reported is fixed in the latest version of
python-urllib3, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Colin Watson <[email protected]> (supplier of updated python-urllib3 package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
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Hash: SHA512
Format: 1.8
Date: Fri, 06 Feb 2026 00:37:49 +0000
Source: python-urllib3
Architecture: source
Version: 2.6.3-1
Distribution: unstable
Urgency: medium
Maintainer: Debian Python Team <[email protected]>
Changed-By: Colin Watson <[email protected]>
Closes: 1122029 1122743
Changes:
python-urllib3 (2.6.3-1) unstable; urgency=medium
.
* Team upload.
* New upstream release:
- CVE-2025-66471: Fixed a security issue where streaming API could
improperly handle highly compressed HTTP content ("decompression
bombs") leading to excessive resource consumption even when a small
amount of data was requested. Reading small chunks of compressed data
is safer and much more efficient now (closes: #1122029).
- Fixed HTTPResponse.read_chunked() to properly handle leftover data in
the decoder's buffer when reading compressed chunked responses
(closes: #1122743).
* Bump Build-Depends/Suggests on python3-brotli to >= 1.2.0 to improve the
fix for CVE-2025-66418.
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