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Security fix for CVE-2026-44431 and CVE-2026-44432

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- Resolves: RHEL-184816
- Resolves: RHEL-185123
This commit is contained in:
Tomáš Hrnčiar 2026-06-03 15:58:47 +02:00
parent 7a00d7a81b
commit 81bb5e162b
3 changed files with 202 additions and 1 deletions
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57
CVE-2026-44431.patch Normal file
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@ -0,0 +1,57 @@
From 90da7b0eeef49a141ea91360dd919c3739e96445 Mon Sep 17 00:00:00 2001
From: Illia Volochii <illia.volochii@gmail.com>
Date: Wed, 3 Jun 2026 15:55:18 +0200
Subject: [PATCH] CVE-2026-44431
* Remove sensitive headers in proxy pools too
* Add a changelog entry
* Check retries history in tests
Co-authored-by: Copilot <copilot@github.com>
---------
Co-authored-by: Copilot <copilot@github.com>
---
changelog/GHSA-qccp-gfcp-xxvc.bugfix.rst | 3 +++
src/urllib3/connectionpool.py | 12 ++++++++++++
2 files changed, 15 insertions(+)
create mode 100644 changelog/GHSA-qccp-gfcp-xxvc.bugfix.rst
diff --git a/changelog/GHSA-qccp-gfcp-xxvc.bugfix.rst b/changelog/GHSA-qccp-gfcp-xxvc.bugfix.rst
new file mode 100644
index 0000000..bac765e
--- /dev/null
+++ b/changelog/GHSA-qccp-gfcp-xxvc.bugfix.rst
@@ -0,0 +1,3 @@
+Fixed HTTP pools created using ``ProxyManager.connection_from_url`` to strip
+sensitive headers specified in ``Retry.remove_headers_on_redirect`` when
+redirecting to a different host.
diff --git a/src/urllib3/connectionpool.py b/src/urllib3/connectionpool.py
index 8f9ebb5..923a5d9 100644
--- a/src/urllib3/connectionpool.py
+++ b/src/urllib3/connectionpool.py
@@ -807,6 +807,18 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
body = None
headers = HTTPHeaderDict(headers)._prepare_for_method_change()
+ # Strip headers marked as unsafe to forward to the redirected location.
+ # Check remove_headers_on_redirect to avoid a potential network call within
+ # self.is_same_host() which may use socket.gethostbyname() in the future.
+ if retries.remove_headers_on_redirect and not self.is_same_host(
+ redirect_location
+ ):
+ new_headers = headers.copy() # type: ignore[union-attr]
+ for header in headers:
+ if header.lower() in retries.remove_headers_on_redirect:
+ new_headers.pop(header, None)
+ headers = new_headers
+
try:
retries = retries.increment(method, url, response=response, _pool=self)
except MaxRetryError:
--
2.54.0

137
CVE-2026-44432.patch Normal file
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@ -0,0 +1,137 @@
From 377ecb4c3bb1bc5e196f13ed7418c3d4b6380afc Mon Sep 17 00:00:00 2001
From: Illia Volochii <illia.volochii@gmail.com>
Date: Wed, 3 Jun 2026 13:02:33 +0200
Subject: [PATCH] CVE-2026-44432
* Avoid any decoding in `HTTPResponse.drain_conn`
* Add a comment
* Simplify `drain_conn`
* Add tests
* Add additional checks to the test
* Fix full decompression on the 2nd small read from response using Brotli
* Add a changelog entry
* Inverse the order in the changelog entry
* Mention `stream` call
---
changelog/GHSA-mf9v-mfxr-j63j.bugfix.rst | 7 +++++++
src/urllib3/response.py | 17 +++++++++++------
test/test_response.py | 24 +++++++++++++++++++++---
3 files changed, 39 insertions(+), 9 deletions(-)
create mode 100644 changelog/GHSA-mf9v-mfxr-j63j.bugfix.rst
diff --git a/changelog/GHSA-mf9v-mfxr-j63j.bugfix.rst b/changelog/GHSA-mf9v-mfxr-j63j.bugfix.rst
new file mode 100644
index 0000000..ac70af8
--- /dev/null
+++ b/changelog/GHSA-mf9v-mfxr-j63j.bugfix.rst
@@ -0,0 +1,7 @@
+Fixed two high-severity security issues where decompression-bomb safeguards of the streaming API were bypassed:
+
+
+1. When ``HTTPResponse.drain_conn()`` was called after the response had been read and decompressed partially.
+2. During the second ``HTTPResponse.read(amt=N)`` or ``HTTPResponse.stream(amt=N)`` call when the response was decompressed using the official `Brotli <https://pypi.org/project/brotli/>`__ library.
+
+See `GHSA-mf9v-mfxr-j63j <https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j>`__ for details.
diff --git a/src/urllib3/response.py b/src/urllib3/response.py
index 1357d65..76c56d2 100644
--- a/src/urllib3/response.py
+++ b/src/urllib3/response.py
@@ -480,13 +480,14 @@ class HTTPResponse(io.IOBase):
Unread data in the HTTPResponse connection blocks the connection from being released back to the pool.
"""
try:
- self.read(
- # Do not spend resources decoding the content unless
- # decoding has already been initiated.
- decode_content=self._has_decoded_content,
- )
+ self._raw_read()
except (HTTPError, SocketError, BaseSSLError, HTTPException):
pass
+ if self._has_decoded_content:
+ # `_raw_read` skips decompression, so we should clean up the
+ # decoder to avoid keeping unnecessary data in memory.
+ self._decoded_buffer = BytesQueueBuffer()
+ self._decoder = None
@property
def data(self):
@@ -800,7 +801,11 @@ class HTTPResponse(io.IOBase):
if amt is not None:
cache_content = False
- if self._decoder and self._decoder.has_unconsumed_tail:
+ if (
+ self._decoder
+ and self._decoder.has_unconsumed_tail
+ and len(self._decoded_buffer) < amt
+ ):
decoded_data = self._decode(
b"",
decode_content,
diff --git a/test/test_response.py b/test/test_response.py
index 597ce46..b0539e5 100644
--- a/test/test_response.py
+++ b/test/test_response.py
@@ -469,22 +469,33 @@ class TestResponse(object):
pytest.skip(f"Proper {request.node.callspec.id} decoder is not available")
name, compressed_data = data
- limit = 1024 * 1024 # 1 MiB
+ limit1 = 1024 * 1024 # 1 MiB
+ # We test with two read calls because the second call may be
+ # able to use the internal buffer filled by the first call, and
+ # we want to ensure that full decompression is never triggered
+ # by the second call. The limit for the second call is lowered
+ # to make sure that the internal buffer is used for the Brotli
+ # case specifically https://github.com/google/brotli/issues/1396
+ limit2 = 1024 # 1 KiB
if read_method in ("read_chunked", "stream"):
httplib_r = httplib.HTTPResponse(MockSock) # type: ignore[arg-type]
+ httplib_r.chunked = True
+ httplib_r.chunk_left = 1
httplib_r.fp = MockChunkedEncodingResponse([compressed_data]) # type: ignore[assignment]
r = HTTPResponse(
httplib_r,
preload_content=False,
headers={"transfer-encoding": "chunked", "content-encoding": name},
)
- next(getattr(r, read_method)(amt=limit, decode_content=True))
+ for limit in (limit1, limit2):
+ next(getattr(r, read_method)(amt=limit, decode_content=True))
else:
fp = BytesIO(compressed_data)
r = HTTPResponse(
fp, headers={"content-encoding": name}, preload_content=False
)
- getattr(r, read_method)(amt=limit, decode_content=True)
+ for limit in (limit1, limit2):
+ getattr(r, read_method)(amt=limit, decode_content=True)
# Check that the internal decoded buffer is empty unless brotli
# is used.
@@ -494,6 +505,13 @@ class TestResponse(object):
if name != "br" or brotli.__name__ == "brotlicffi":
assert len(r._decoded_buffer) == 0
+ # Check that memory usage is still within the limit while the
+ # connection is being drained, meaning that the call does not
+ # decompress the whole content.
+ r.drain_conn()
+ assert r._decoder is None
+ assert len(r._decoded_buffer) == 0
+
def test_multi_decoding_deflate_deflate(self):
data = zlib.compress(zlib.compress(b"foo"))
--
2.54.0

9
python-urllib3.spec
View File

@ -6,7 +6,7 @@
Name: python-%{srcname}
Version: 1.26.5
Release: 7%{?dist}
Release: 8%{?dist}
Summary: Python HTTP library with thread-safe connection pooling and file post
License: MIT
@ -46,6 +46,9 @@ Patch4: CVE-2024-37891.patch
Patch5: CVE-2025-66471.patch
Patch6: CVE-2025-66418.patch
Patch7: CVE-2026-21441.patch
Patch8: CVE-2026-44431.patch
Patch9: CVE-2026-44432.patch
%description
Python HTTP module with connection pooling and file POST abilities.
@ -149,6 +152,10 @@ ln -s %{python3_sitelib}/__pycache__/six.cpython-%{python3_version_nodots}.pyc \
%changelog
* Wed Jun 03 2026 Tomáš Hrnčiar <thrnciar@redhat.com> - 1.26.5-8
- Security fix for CVE-2026-44431 and CVE-2026-44432
Resolves: RHEL-184816, RHEL-185123
* Tue Jan 27 2026 Miro Hrončok <mhroncok@redhat.com> - 1.26.5-7
- Security fix for CVE-2025-66471
- Security fix for CVE-2025-66418