[OE-core][whinlatter 03/11] python3-urllib3: patch CVE-2025-66418

Yoann Congal
2026-01-07T08:09:32Z

From: Peter Marko <peter.marko@siemens.com>

Pick patch per [1].

[1] https://nvd.nist.gov/vuln/detail/CVE-2025-66418

Signed-off-by: Peter Marko <peter.marko@siemens.com>
---
.../python3-urllib3/CVE-2025-66418.patch | 74 +++++++++++++++++++
.../python/python3-urllib3_2.5.0.bb | 4 +
2 files changed, 78 insertions(+)
create mode 100644 meta/recipes-devtools/python/python3-urllib3/CVE-2025-66418.patch

diff --git a/meta/recipes-devtools/python/python3-urllib3/CVE-2025-66418.patch b/meta/recipes-devtools/python/python3-urllib3/CVE-2025-66418.patch
new file mode 100644
index 0000000000..71fc44e4f9
--- /dev/null
+++ b/meta/recipes-devtools/python/python3-urllib3/CVE-2025-66418.patch
@@ -0,0 +1,74 @@
+From 24d7b67eac89f94e11003424bcf0d8f7b72222a8 Mon Sep 17 00:00:00 2001
+From: Illia Volochii <illia.volochii@gmail.com>
+Date: Fri, 5 Dec 2025 16:41:33 +0200
+Subject: [PATCH] Merge commit from fork
+
+* Add a hard-coded limit for the decompression chain
+
+* Reuse new list
+
+CVE: CVE-2025-66418
+Upstream-Status: Backport [https://github.com/urllib3/urllib3/commit/24d7b67eac89f94e11003424bcf0d8f7b72222a8]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ changelog/GHSA-gm62-xv2j-4w53.security.rst | 4 ++++
+ src/urllib3/response.py | 12 +++++++++++-
+ test/test_response.py | 10 ++++++++++
+ 3 files changed, 25 insertions(+), 1 deletion(-)
+ create mode 100644 changelog/GHSA-gm62-xv2j-4w53.security.rst
+
+diff --git a/changelog/GHSA-gm62-xv2j-4w53.security.rst b/changelog/GHSA-gm62-xv2j-4w53.security.rst
+new file mode 100644
+index 00000000..6646eaa3
+--- /dev/null
++++ b/changelog/GHSA-gm62-xv2j-4w53.security.rst
+@@ -0,0 +1,4 @@
++Fixed a security issue where an attacker could compose an HTTP response with
++virtually unlimited links in the ``Content-Encoding`` header, potentially
++leading to a denial of service (DoS) attack by exhausting system resources
++during decoding. The number of allowed chained encodings is now limited to 5.
+diff --git a/src/urllib3/response.py b/src/urllib3/response.py
+index 4ba42136..069f726c 100644
+--- a/src/urllib3/response.py
++++ b/src/urllib3/response.py
+@@ -220,8 +220,18 @@ class MultiDecoder(ContentDecoder):
+ they were applied.
+ """
+
++ # Maximum allowed number of chained HTTP encodings in the
++ # Content-Encoding header.
++ max_decode_links = 5
++
+ def __init__(self, modes: str) -> None:
+- self._decoders = [_get_decoder(m.strip()) for m in modes.split(",")]
++ encodings = [m.strip() for m in modes.split(",")]
++ if len(encodings) > self.max_decode_links:
++ raise DecodeError(
++ "Too many content encodings in the chain: "
++ f"{len(encodings)} > {self.max_decode_links}"
++ )
++ self._decoders = [_get_decoder(e) for e in encodings]
+
+ def flush(self) -> bytes:
+ return self._decoders[0].flush()
+diff --git a/test/test_response.py b/test/test_response.py
+index 9592fdd9..d824ae70 100644
+--- a/test/test_response.py
++++ b/test/test_response.py
+@@ -584,6 +584,16 @@ class TestResponse:
+ assert r.read(9 * 37) == b"foobarbaz" * 37
+ assert r.read() == b""
+
++ def test_read_multi_decoding_too_many_links(self) -> None:
++ fp = BytesIO(b"foo")
++ with pytest.raises(
++ DecodeError, match="Too many content encodings in the chain: 6 > 5"
++ ):
++ HTTPResponse(
++ fp,
++ headers={"content-encoding": "gzip, deflate, br, zstd, gzip, deflate"},
++ )
++
+ def test_body_blob(self) -> None:
+ resp = HTTPResponse(b"foo")
+ assert resp.data == b"foo"
diff --git a/meta/recipes-devtools/python/python3-urllib3_2.5.0.bb b/meta/recipes-devtools/python/python3-urllib3_2.5.0.bb
index 62fdf8e345..c39e9676e8 100644
--- a/meta/recipes-devtools/python/python3-urllib3_2.5.0.bb
+++ b/meta/recipes-devtools/python/python3-urllib3_2.5.0.bb
@@ -7,6 +7,10 @@ SRC_URI[sha256sum] = "3fc47733c7e419d4bc3f6b3dc2b4f890bb743906a30d56ba4a5bfa4bbf

inherit pypi python_hatchling

+SRC_URI += "\
+ file://CVE-2025-66418.patch \
+"
+
DEPENDS += "python3-hatch-vcs-native"

PACKAGECONFIG ??= ""