new file mode 100644
@@ -0,0 +1,223 @@
+From e743e63ca083402fe0a344c4837cc6acf3081987 Mon Sep 17 00:00:00 2001
+From: Damian Shaw <damian.peter.shaw@gmail.com>
+Date: Tue, 30 Jun 2026 21:52:39 -0400
+Subject: [PATCH] Fix Link.filename decoding URL path twice (#14110)
+
+Link already percent-decodes the URL path into `self._path`, but
+`Link.filename` decoded the basename again, so a doubly-encoded
+separator was decoded twice: `%252F` became `%2F` in `__init__`, then
+`/` in `filename`, turning the single component `a%2Fb.whl` into
+`a/b.whl`.
+
+Drop the second decode, and add a `join_within_directory` helper so the
+download-path joins treat the name as a single path component.
+
+CVE: CVE-2026-13346
+Upstream-Status: Backport [https://github.com/pypa/pip/commit/10dfb6b9005484578b386f64b9f36982e3dc6679]
+
+Backport Changes:
+- Adapted imports and download call sites to pip 24.0.
+- Secured pip 24.0 separate BatchDownloader path.
+- Omitted tests absent from the pip 24.0 source archive.
+
+(cherry picked from commit 10dfb6b9005484578b386f64b9f36982e3dc6679)
+Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
+---
+ news/14110.bugfix.rst | 1 +
+ src/pip/_internal/models/link.py | 63 ++++++++++++++++++++-----
+ src/pip/_internal/network/download.py | 20 +++++---
+ src/pip/_internal/operations/prepare.py | 6 +--
+ 4 files changed, 69 insertions(+), 21 deletions(-)
+ create mode 100644 news/14110.bugfix.rst
+
+diff --git a/news/14110.bugfix.rst b/news/14110.bugfix.rst
+new file mode 100644
+index 000000000..f7d4f7888
+--- /dev/null
++++ b/news/14110.bugfix.rst
+@@ -0,0 +1 @@
++Fix ``Link.filename`` decoding the URL path twice.
+diff --git a/src/pip/_internal/models/link.py b/src/pip/_internal/models/link.py
+index 73041b864..e4bd559bf 100644
+--- a/src/pip/_internal/models/link.py
++++ b/src/pip/_internal/models/link.py
+@@ -13,6 +13,7 @@ from typing import (
+ List,
+ Mapping,
+ NamedTuple,
++ NewType,
+ Optional,
+ Tuple,
+ Union,
+@@ -36,6 +37,49 @@ if TYPE_CHECKING:
+ logger = logging.getLogger(__name__)
+
+
++# A single path component: percent-decoded once and reduced to a basename, so it
++# contains no path separator and is not a ``.`` or ``..`` reference. The empty
++# string means "no component".
++PathComponent = NewType("PathComponent", str)
++
++
++def _to_path_component(name: str) -> PathComponent:
++ """Reduce ``name`` to a single path component, or ``""`` if it has none.
++
++ ``os.path.basename`` drops any directory part, drive letter, or separator;
++ a ``.``, ``..``, or empty result is not a component and becomes ``""``.
++ """
++ name = os.path.basename(name)
++ if name in ("", os.curdir, os.pardir):
++ return PathComponent("")
++
++ return PathComponent(name)
++
++
++def as_path_component(name: str) -> PathComponent:
++ """Like ``_to_path_component`` but reject the empty result.
++
++ Use where a file is about to be written, so a missing name is an error
++ rather than a silent fallback to the directory itself.
++ """
++ component = _to_path_component(name)
++ if not component:
++ raise ValueError(f"Unexpected file name derived from URL: {name!r}")
++
++ return component
++
++
++def join_within_directory(directory: str, component: PathComponent) -> str:
++ """Join a single path ``component`` onto ``directory``.
++
++ ``component`` is a :data:`PathComponent`, so by type it has no separator and
++ is not a ``.`` or ``..`` reference; the result can never escape ``directory``.
++ Requiring ``PathComponent`` rather than ``str`` lets the type checker enforce
++ at the call site that the name was reduced to a safe component beforehand.
++ """
++ return os.path.join(directory, component)
++
++
+ # Order matters, earlier hashes have a precedence over later hashes for what
+ # we will pick to use.
+ _SUPPORTED_HASHES = ("sha512", "sha384", "sha256", "sha224", "sha1", "md5")
+@@ -380,18 +424,13 @@ class Link(KeyBasedCompareMixin):
+ return self._url
+
+ @property
+- def filename(self) -> str:
+- path = self.path.rstrip("/")
+- name = posixpath.basename(path)
+- if not name:
+- # Make sure we don't leak auth information if the netloc
+- # includes a username and password.
+- netloc, user_pass = split_auth_from_netloc(self.netloc)
+- return netloc
+-
+- name = urllib.parse.unquote(name)
+- assert name, f"URL {self._url!r} produced no filename"
+- return name
++ def filename(self) -> PathComponent:
++ name = _to_path_component(posixpath.basename(self.path.rstrip("/")))
++ if name:
++ return name
++
++ # No component in the path; fall back to the netloc, dropping any auth.
++ return _to_path_component(split_auth_from_netloc(self.netloc)[0])
+
+ @property
+ def file_path(self) -> str:
+diff --git a/src/pip/_internal/network/download.py b/src/pip/_internal/network/download.py
+index d1d43541e..3aec97e84 100644
+--- a/src/pip/_internal/network/download.py
++++ b/src/pip/_internal/network/download.py
+@@ -11,7 +11,12 @@ from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response
+ from pip._internal.cli.progress_bars import get_download_progress_renderer
+ from pip._internal.exceptions import NetworkConnectionError
+ from pip._internal.models.index import PyPI
+-from pip._internal.models.link import Link
++from pip._internal.models.link import (
++ Link,
++ PathComponent,
++ as_path_component,
++ join_within_directory,
++)
+ from pip._internal.network.cache import is_from_cache
+ from pip._internal.network.session import PipSession
+ from pip._internal.network.utils import HEADERS, raise_for_status, response_chunks
+@@ -91,11 +96,14 @@ def parse_content_disposition(content_disposition: str, default_filename: str) -
+ return filename or default_filename
+
+
+-def _get_http_response_filename(resp: Response, link: Link) -> str:
++def _get_http_response_filename(resp: Response, link: Link) -> PathComponent:
+ """Get an ideal filename from the given HTTP response, falling back to
+ the link filename if not provided.
++
++ The result is validated as a single path component, so it can be joined onto
++ a download directory without escaping it.
+ """
+- filename = link.filename # fallback
++ filename: str = link.filename # fallback
+ # Have a look at the Content-Disposition header for a better guess
+ content_disposition = resp.headers.get("content-disposition")
+ if content_disposition:
+@@ -109,7 +117,7 @@ def _get_http_response_filename(resp: Response, link: Link) -> str:
+ ext = os.path.splitext(resp.url)[1]
+ if ext:
+ filename += ext
+- return filename
++ return as_path_component(filename)
+
+
+ def _http_get_download(session: PipSession, link: Link) -> Response:
+@@ -140,7 +148,7 @@ class Downloader:
+ raise
+
+ filename = _get_http_response_filename(resp, link)
+- filepath = os.path.join(location, filename)
++ filepath = join_within_directory(location, filename)
+
+ chunks = _prepare_download(resp, link, self._progress_bar)
+ with open(filepath, "wb") as content_file:
+@@ -176,7 +184,7 @@ class BatchDownloader:
+ raise
+
+ filename = _get_http_response_filename(resp, link)
+- filepath = os.path.join(location, filename)
++ filepath = join_within_directory(location, filename)
+
+ chunks = _prepare_download(resp, link, self._progress_bar)
+ with open(filepath, "wb") as content_file:
+diff --git a/src/pip/_internal/operations/prepare.py b/src/pip/_internal/operations/prepare.py
+index 956717d1e..0a9b39332 100644
+--- a/src/pip/_internal/operations/prepare.py
++++ b/src/pip/_internal/operations/prepare.py
+@@ -26,7 +26,7 @@ from pip._internal.exceptions import (
+ from pip._internal.index.package_finder import PackageFinder
+ from pip._internal.metadata import BaseDistribution, get_metadata_distribution
+ from pip._internal.models.direct_url import ArchiveInfo
+-from pip._internal.models.link import Link
++from pip._internal.models.link import Link, join_within_directory
+ from pip._internal.models.wheel import Wheel
+ from pip._internal.network.download import BatchDownloader, Downloader
+ from pip._internal.network.lazy_wheel import (
+@@ -189,7 +189,7 @@ def _check_download_dir(
+ """Check download_dir for previously downloaded file with correct hash
+ If a correct file is found return its path else None
+ """
+- download_path = os.path.join(download_dir, link.filename)
++ download_path = join_within_directory(download_dir, link.filename)
+
+ if not os.path.exists(download_path):
+ return None
+@@ -666,7 +666,7 @@ class RequirementPreparer:
+ # No distribution was downloaded for this requirement.
+ return
+
+- download_location = os.path.join(self.download_dir, link.filename)
++ download_location = join_within_directory(self.download_dir, link.filename)
+ if not os.path.exists(download_location):
+ shutil.copy(req.local_file_path, download_location)
+ download_path = display_path(download_location)
+--
+2.35.6
+
@@ -33,6 +33,7 @@ inherit pypi python_setuptools_build_meta
SRC_URI += "file://no_shebang_mangling.patch \
file://CVE-2026-1703.patch \
+ file://CVE-2026-13346.patch \
"
SRC_URI[sha256sum] = "ea9bd1a847e8c5774a5777bb398c19e80bcd4e2aa16a4b301b718fe6f593aba2"