python3-urllib3: patch CVE-2025-66418

Pick patch per [1].

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

(From OE-Core rev: 469fcdd5f07635fa9e308c968126807c1ca09647)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 75 insertions, 0 deletions

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..b490019d87
--- /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
+@@ -135,8 +135,18 @@ class MultiDecoder(object):
+         they were applied.
+     """
+ 
++    # Maximum allowed number of chained HTTP encodings in the
++    # Content-Encoding header.
++    max_decode_links = 5
++
+     def __init__(self, modes):
+-        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):
+         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
+@@ -295,6 +295,16 @@ class TestResponse(object):
+ 
+         assert r.data == b"foo"
+ 
++    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):
+         resp = HTTPResponse(b"foo")
+         assert resp.data == b"foo"
diff --git a/meta/recipes-devtools/python/python3-urllib3_1.26.20.bb b/meta/recipes-devtools/python/python3-urllib3_1.26.20.bb
index 58988e4205..1f1132d5b5 100644
--- a/meta/recipes-devtools/python/python3-urllib3_1.26.20.bb
+++ b/meta/recipes-devtools/python/python3-urllib3_1.26.20.bb
@@ -9,6 +9,7 @@ inherit pypi setuptools3
 
 SRC_URI += " \
     file://CVE-2025-50181.patch \
+    file://CVE-2025-66418.patch \
 "
 
 RDEPENDS:${PN} += "\