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python-urllib3

HTTP library with thread-safe connection pooling for Python3

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general

source: python-urllib3 (main)
version: 2.6.3-2
maintainer: Debian Python Team (DMD)
uploaders: Daniele Tricoli [DMD]
arch: all
std-ver: 4.7.3
VCS: Git (Browse, QA)

versions [more versions can be listed by madison] [old versions available from snapshot.debian.org]

[pool directory]

o-o-stable: 1.26.5-1~exp1
o-o-sec: 1.26.5-1~exp1+deb11u3
oldstable: 1.26.12-1+deb12u3
old-sec: 1.26.12-1+deb12u3
stable: 2.3.0-3+deb13u1
stable-sec: 2.3.0-3+deb13u1
testing: 2.6.3-2
unstable: 2.6.3-2

versioned links

1.26.5-1~exp1: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
1.26.5-1~exp1+deb11u3: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
1.26.12-1+deb12u3: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
2.3.0-3+deb13u1: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]
2.6.3-2: [.dsc, use dget on this link to retrieve source package] [changelog] [copyright] [rules] [control]

binaries

python3-urllib3

action needed

A new upstream version is available: 2.7.0 high

A new upstream version 2.7.0 is available, you should consider packaging it.

Created: 2026-05-09 Last update: 2026-05-23 15:00

2 security issues in trixie high

There are 2 open security issues in trixie.

1 important issue:

CVE-2026-44431: urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.

1 ignored issue:

CVE-2025-66471: 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.

Created: 2025-12-05 Last update: 2026-05-16 15:30

2 security issues in sid high

There are 2 open security issues in sid.

2 important issues:

CVE-2026-44431: urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.
CVE-2026-44432: urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.

Created: 2026-05-14 Last update: 2026-05-16 15:30

2 security issues in forky high

There are 2 open security issues in forky.

2 important issues:

CVE-2026-44431: urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.
CVE-2026-44432: urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.

Created: 2026-05-14 Last update: 2026-05-16 15:30

2 security issues in bullseye high

There are 2 open security issues in bullseye.

1 important issue:

CVE-2026-44431: urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.

1 ignored issue:

CVE-2025-66471: 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.

Created: 2026-05-14 Last update: 2026-05-16 15:30

2 security issues in bookworm high

There are 2 open security issues in bookworm.

1 important issue:

CVE-2026-44431: urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.

1 ignored issue:

CVE-2025-66471: 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.

Created: 2025-06-20 Last update: 2026-05-16 15:30

1 security issue in buster high

There is 1 open security issue in buster.

1 important issue:

CVE-2024-37891: urllib3 is a user-friendly HTTP client library for Python. When using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib3's proxy support, it's possible to accidentally configure the `Proxy-Authorization` header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident. Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the `Proxy-Authorization` header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach. We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited: 1. Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support. 2. Not disabling HTTP redirects. 3. Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin. Users are advised to update to either version 1.26.19 or version 2.2.2. Users unable to upgrade may use the `Proxy-Authorization` header with urllib3's `ProxyManager`, disable HTTP redirects using `redirects=False` when sending requests, or not user the `Proxy-Authorization` header as mitigations.

Created: 2024-06-17 Last update: 2024-06-24 17:49

debian/patches: 1 patch to forward upstream low

Among the 1 debian patch available in version 2.6.3-2 of the package, we noticed the following issues:

1 patch where the metadata indicates that the patch has not yet been forwarded upstream. You should either forward the patch upstream or update the metadata to document its real status.

Created: 2024-01-22 Last update: 2026-03-18 18:32

Standards version of the package is outdated. wishlist

The package should be updated to follow the last version of Debian Policy (Standards-Version 4.7.4 instead of 4.7.3).

Created: 2026-03-31 Last update: 2026-03-31 15:01

news

[2026-03-21] python-urllib3 2.6.3-2 MIGRATED to testing (Debian testing watch)
[2026-03-18] Accepted python-urllib3 2.6.3-2 (source) into unstable (Colin Watson)
[2026-02-08] python-urllib3 2.6.3-1 MIGRATED to testing (Debian testing watch)
[2026-02-06] Accepted python-urllib3 2.6.3-1 (source) into unstable (Colin Watson)
[2026-01-24] Accepted python-urllib3 1.26.12-1+deb12u3 (source) into oldstable-proposed-updates (Debian FTP Masters) (signed by: Salvatore Bonaccorso)
[2026-01-24] Accepted python-urllib3 1.26.12-1+deb12u2 (source) into oldstable-proposed-updates (Debian FTP Masters) (signed by: Salvatore Bonaccorso)
[2026-01-24] Accepted python-urllib3 2.3.0-3+deb13u1 (source) into proposed-updates (Debian FTP Masters) (signed by: Salvatore Bonaccorso)
[2026-01-23] Accepted python-urllib3 1.26.5-1~exp1+deb11u3 (source) into oldoldstable-security (Guilhem Moulin)
[2026-01-22] Accepted python-urllib3 1.26.12-1+deb12u3 (source) into oldstable-security (Debian FTP Masters) (signed by: Salvatore Bonaccorso)
[2026-01-20] python-urllib3 2.5.0-2 MIGRATED to testing (Debian testing watch)
[2026-01-17] Accepted python-urllib3 2.3.0-3+deb13u1 (source) into stable-security (Debian FTP Masters) (signed by: Salvatore Bonaccorso)
[2026-01-17] Accepted python-urllib3 1.26.12-1+deb12u2 (source) into oldstable-security (Debian FTP Masters) (signed by: Salvatore Bonaccorso)
[2026-01-10] Accepted python-urllib3 2.5.0-2 (source) into unstable (Santiago Vila)
[2026-01-08] Accepted python-urllib3 2.5.0-1.1 (source) into unstable (Salvatore Bonaccorso)
[2025-12-26] Accepted python-urllib3 1.26.5-1~exp1+deb11u2 (source) into oldoldstable-security (Guilhem Moulin)
[2025-08-25] python-urllib3 2.5.0-1 MIGRATED to testing (Debian testing watch)
[2025-08-18] Accepted python-urllib3 2.5.0-1 (source) into unstable (Colin Watson)
[2025-07-21] python-urllib3 2.3.0-3 MIGRATED to testing (Debian testing watch)
[2025-07-13] Accepted python-urllib3 2.3.0-3 (source) into unstable (Colin Watson)
[2025-03-16] python-urllib3 2.3.0-2 MIGRATED to testing (Debian testing watch)
[2025-03-12] Accepted python-urllib3 2.3.0-2 (source) into unstable (Colin Watson)
[2025-01-23] python-urllib3 2.3.0-1 MIGRATED to testing (Debian testing watch)
[2025-01-17] Accepted python-urllib3 2.3.0-1 (source) into unstable (Colin Watson)
[2025-01-03] Accepted python-urllib3 1.26.12-1+deb12u1 (source) into proposed-updates (Debian FTP Masters) (signed by: Guilhem Moulin)
[2024-12-21] Accepted python-urllib3 1.26.5-1~exp1+deb11u1 (source) into oldstable-security (Guilhem Moulin)
[2024-12-14] python-urllib3 2.2.3-4 MIGRATED to testing (Debian testing watch)
[2024-12-11] Accepted python-urllib3 2.2.3-4 (source) into unstable (Alexandre Detiste)
[2024-12-02] python-urllib3 2.2.3-3 MIGRATED to testing (Debian testing watch)
[2024-11-29] Accepted python-urllib3 2.2.3-3 (source) into unstable (Colin Watson)
[2024-11-13] Accepted python-urllib3 2.2.3-2 (source) into experimental (Colin Watson)

1
2

bugs [bug history graph]

all: 2
RC: 0
I&N: 2
M&W: 0
F&P: 0
patch: 0

links

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ubuntu

[Information about Ubuntu for Debian Developers]

version: 2.6.3-1ubuntu1
2 bugs

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