From: Benjamin Robin (Schneider Electric) <[email protected]>
When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer. Signed-off-by: Benjamin Robin (Schneider Electric) <[email protected]> Signed-off-by: Mathieu Dubois-Briand <[email protected]> Signed-off-by: Richard Purdie <[email protected]> (cherry picked from commit bbd9c82298880ab61b9befea97dfe8a0a4943836) [YC: re-added removed Co-authored-by: trailer to the patch] Signed-off-by: Yoann Congal <[email protected]> --- .../python/python3/CVE-2026-11972.patch | 61 +++++++++++++++++++ .../recipes-devtools/python/python3_3.14.6.bb | 1 + 2 files changed, 62 insertions(+) create mode 100644 meta/recipes-devtools/python/python3/CVE-2026-11972.patch diff --git a/meta/recipes-devtools/python/python3/CVE-2026-11972.patch b/meta/recipes-devtools/python/python3/CVE-2026-11972.patch new file mode 100644 index 00000000000..12a79754feb --- /dev/null +++ b/meta/recipes-devtools/python/python3/CVE-2026-11972.patch @@ -0,0 +1,61 @@ +From 2d256d4bfd654bdcaf2d96733799be73b8ff8f69 Mon Sep 17 00:00:00 2001 +From: Petr Viktorin <[email protected]> +Date: Tue, 23 Jun 2026 15:13:30 +0200 +Subject: [PATCH 2/2] gh-151981: Make tarfile._Stream.seek break at EOF + (GH-151982) + +Co-authored-by: Stan Ulbrych <[email protected]> + +CVE: CVE-2026-11972 +Upstream-Status: Backport [https://github.com/python/cpython/commit/f50bf13566189c8d0ce5a814f33eff3d89951896] + +Signed-off-by: Benjamin Robin <[email protected]> +--- + Lib/tarfile.py | 4 +++- + Lib/test/test_tarfile.py | 16 ++++++++++++++++ + 2 files changed, 19 insertions(+), 1 deletion(-) + +diff --git a/Lib/tarfile.py b/Lib/tarfile.py +index 63f23490e8a1..399f906efdff 100644 +--- a/Lib/tarfile.py ++++ b/Lib/tarfile.py +@@ -524,7 +524,9 @@ def seek(self, pos=0): + if pos - self.pos >= 0: + blocks, remainder = divmod(pos - self.pos, self.bufsize) + for i in range(blocks): +- self.read(self.bufsize) ++ data = self.read(self.bufsize) ++ if not data: ++ break + self.read(remainder) + else: + raise StreamError("seeking backwards is not allowed") +diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py +index 0fc7413be8db..045377d620cc 100644 +--- a/Lib/test/test_tarfile.py ++++ b/Lib/test/test_tarfile.py +@@ -4786,6 +4786,22 @@ def valueerror_filter(tarinfo, path): + with self.check_context(arc.open(errorlevel='boo!'), filtererror_filter): + self.expect_exception(TypeError) # errorlevel is not int + ++ @support.subTests('format', [tarfile.GNU_FORMAT, tarfile.PAX_FORMAT]) ++ def test_getmembers_big_size(self, format): ++ # gh-151981: A loop in seek() for streaming files tried to read the ++ # declared number of blocks even at EOF ++ tinfo = tarfile.TarInfo("huge-file") ++ tinfo.size = 1 << 64 ++ bio = io.BytesIO() ++ # Write header without data ++ bio.write(tinfo.tobuf(format)) ++ ++ # Reset & try to get contents ++ bio.seek(0) ++ with tarfile.open(fileobj=bio, mode="r|") as tar: ++ with self.assertRaises(tarfile.ReadError): ++ tar.getmembers() ++ + + class OverwriteTests(archiver_tests.OverwriteTests, unittest.TestCase): + testdir = os.path.join(TEMPDIR, "testoverwrite") +-- +2.54.0 diff --git a/meta/recipes-devtools/python/python3_3.14.6.bb b/meta/recipes-devtools/python/python3_3.14.6.bb index 80be938ed50..0a9e82d445f 100644 --- a/meta/recipes-devtools/python/python3_3.14.6.bb +++ b/meta/recipes-devtools/python/python3_3.14.6.bb @@ -36,6 +36,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \ file://0001-test_only_active_thread-skip-problematic-test.patch \ file://0001-prefer-valid-entrypoints.patch \ file://CVE-2026-11940.patch \ + file://CVE-2026-11972.patch \ " SRC_URI:append:class-native = " \ file://0001-Lib-sysconfig.py-use-prefix-value-from-build-configu.patch \
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