[wrynose,12/27] python3-git: fix CVE-2026-73620

diff --git a/meta/recipes-devtools/python/python3-git/CVE-2026-73620.patch b/meta/recipes-devtools/python/python3-git/CVE-2026-73620.patch
new file mode 100644
index 0000000000..816180c2d7
--- /dev/null
+++ b/meta/recipes-devtools/python/python3-git/CVE-2026-73620.patch
@@ -0,0 +1,130 @@ 
+From cc80ea13457773907fa7843e274dca8dc7d196a5 Mon Sep 17 00:00:00 2001
+From: "GPT 5.6" <codex@openai.com>
+Date: Sun, 26 Jul 2026 05:54:27 +0200
+Subject: [PATCH] Block unsafe checkout-index and tag file options
+
+GHSA-3f7w-8rr8-f37f reports that caller-controlled options forwarded by
+IndexFile.checkout() and TagReference.create() can make Git write to or read
+from arbitrary filesystem paths.
+
+Add regression coverage proving the unsafe options are rejected by default while
+preserving the explicit allow_unsafe_options escape hatch. Reuse GitPython's
+existing option candidate normalization and unsafe-option guard at both public
+API boundaries.
+
+Git baseline: a23bace963d508bd96983cc637131392d3face18.
+Documentation/git-checkout-index.adoc defines --prefix as prepending an output
+path, and Documentation/git-tag.adoc defines -F/--file as reading a tag message
+from a file.
+
+CVE: CVE-2026-73620
+Upstream-Status: Backport [https://github.com/gitpython-developers/GitPython/commit/3af0c2516c5e18c829da30338614688f6b69b49c]
+
+Backport Changes:
+- Omitted test/test_index.py, test/test_refs.py because the current PyPI 
+  source archive does not include the test suite and the python3-git 
+  recipe does not run it.
+
+Co-authored-by: Sebastian Thiel <sebastian.thiel@icloud.com>
+(cherry picked from commit 3af0c2516c5e18c829da30338614688f6b69b49c)
+Signed-off-by: Yogita Urade <yurade@cisco.com>
+---
+ git/index/base.py | 12 ++++++++++++
+ git/refs/tag.py   | 13 +++++++++++++
+ 2 files changed, 25 insertions(+)
+
+diff --git a/git/index/base.py b/git/index/base.py
+index dfe7e0dc..90d4c16f 100644
+--- a/git/index/base.py
++++ b/git/index/base.py
+@@ -130,6 +130,8 @@ class IndexFile(LazyMixin, git_diff.Diffable, Serializable):
+     index directly before operating on it using the git command.
+     """
+ 
++    unsafe_git_checkout_index_options = ["--prefix"]
++
+     __slots__ = ("repo", "version", "entries", "_extension_data", "_file_path")
+ 
+     _VERSION = 2
+@@ -1199,6 +1201,7 @@ class IndexFile(LazyMixin, git_diff.Diffable, Serializable):
+         paths: Union[None, Iterable[PathLike]] = None,
+         force: bool = False,
+         fprogress: Callable = lambda *args: None,
++        allow_unsafe_options: bool = False,
+         **kwargs: Any,
+     ) -> Union[None, Iterator[PathLike], Sequence[PathLike]]:
+         """Check out the given paths or all files from the version known to the index
+@@ -1225,6 +1228,9 @@ class IndexFile(LazyMixin, git_diff.Diffable, Serializable):
+             no explicit paths are given. Otherwise progress information will be send
+             prior and after a file has been checked out.
+ 
++        :param allow_unsafe_options:
++            Allow unsafe options, such as ``--prefix``.
++
+         :param kwargs:
+             Additional arguments to be passed to :manpage:`git-checkout-index(1)`.
+ 
+@@ -1248,6 +1254,12 @@ class IndexFile(LazyMixin, git_diff.Diffable, Serializable):
+             i.e. if you want :manpage:`git-checkout(1)`-like behaviour, use
+             ``head.checkout`` instead of ``index.checkout``.
+         """
++        if not allow_unsafe_options:
++            Git.check_unsafe_options(
++                options=Git._option_candidates([], kwargs),
++                unsafe_options=self.unsafe_git_checkout_index_options,
++            )
++
+         args = ["--index"]
+         if force:
+             args.append("--force")
+diff --git a/git/refs/tag.py b/git/refs/tag.py
+index 1e38663a..487eaa14 100644
+--- a/git/refs/tag.py
++++ b/git/refs/tag.py
+@@ -16,6 +16,7 @@ from .reference import Reference
+ 
+ from typing import Any, TYPE_CHECKING, Type, Union
+ 
++from git.cmd import Git
+ from git.types import AnyGitObject, PathLike
+ 
+ if TYPE_CHECKING:
+@@ -42,6 +43,8 @@ class TagReference(Reference):
+ 
+     __slots__ = ()
+ 
++    unsafe_git_tag_options = ["--file", "-F"]
++
+     _common_default = "tags"
+     _common_path_default = Reference._common_path_default + "/" + _common_default
+ 
+@@ -92,6 +95,7 @@ class TagReference(Reference):
+         reference: Union[str, "SymbolicReference"] = "HEAD",
+         logmsg: Union[str, None] = None,
+         force: bool = False,
++        allow_unsafe_options: bool = False,
+         **kwargs: Any,
+     ) -> "TagReference":
+         """Create a new tag reference.
+@@ -121,12 +125,21 @@ class TagReference(Reference):
+         :param force:
+             If ``True``, force creation of a tag even though that tag already exists.
+ 
++        :param allow_unsafe_options:
++            Allow unsafe options, such as ``--file``.
++
+         :param kwargs:
+             Additional keyword arguments to be passed to :manpage:`git-tag(1)`.
+ 
+         :return:
+             A new :class:`TagReference`.
+         """
++        if not allow_unsafe_options:
++            Git.check_unsafe_options(
++                options=Git._option_candidates([], kwargs),
++                unsafe_options=cls.unsafe_git_tag_options,
++            )
++
+         if "ref" in kwargs and kwargs["ref"]:
+             reference = kwargs["ref"]
+ 
diff --git a/meta/recipes-devtools/python/python3-git_3.1.43.bb b/meta/recipes-devtools/python/python3-git_3.1.43.bb
index f712a0e699..d47ce73d72 100644
--- a/meta/recipes-devtools/python/python3-git_3.1.43.bb
+++ b/meta/recipes-devtools/python/python3-git_3.1.43.bb
@@ -33,6 +33,7 @@  SRC_URI += "file://CVE-2026-42284.patch \
            file://CVE-2026-73624.patch \
            file://CVE-2026-73622.patch \
            file://CVE-2026-73621.patch \
+           file://CVE-2026-73620.patch \
            "
 SRC_URI[sha256sum] = "35f314a9f878467f5453cc1fee295c3e18e52f1b99f10f6cf5b1682e968a9e7c"