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Follow up the PYTHON-6110 CVE fix: its regex flags scan leaves a one-byte boundary error after consuming the pattern terminator. Apply PYTHON-6111's correction and terminator-overlap regression test. [1] https://github.com/mongodb/mongo-python-driver/commit/bb8d4e195275e75bd94ebeffb53cc747d357fcf4 [2] https://github.com/mongodb/mongo-python-driver/commit/b5a36ccbdb97298fbf9b5b5767affe92c534461f [3] https://jira.mongodb.org/browse/PYTHON-6110 [4] https://jira.mongodb.org/browse/PYTHON-6111 Signed-off-by: Yogita Urade --- .../CVE-2026-106435-regression.patch | 79 +++++++++++ .../python3-pymongo/CVE-2026-106435.patch | 134 ++++++++++++++++++ .../python/python3-pymongo_4.6.3.bb | 2 + 3 files changed, 215 insertions(+) create mode 100644 meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435-regression.patch create mode 100644 meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435.patch diff --git a/meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435-regression.patch b/meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435-regression.patch new file mode 100644 index 0000000000..2f3e0ded99 --- /dev/null +++ b/meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435-regression.patch @@ -0,0 +1,79 @@ +From b5a36ccbdb97298fbf9b5b5767affe92c534461f Mon Sep 17 00:00:00 2001 +From: Steven Silvester +Date: Tue, 13 Oct 2026 09:30:43 -0500 +Subject: [PATCH] PYTHON-6111 C extension accepts BSON documents where element + data overlaps the document terminator (#3113) + +CVE: CVE-2026-106435 +Upstream-Status: Backport [https://github.com/mongodb/mongo-python-driver/commit/b5a36ccbdb97298fbf9b5b5767affe92c534461f] + +Backport Changes: +- Omitted doc/changelog.rst file changes. + +Signed-off-by: Yogita Urade +--- + bson/_cbsonmodule.c | 7 ++++++- + test/test_bson.py | 34 ++++++++++++++++++++++++++++++++++ + 2 files changed, 40 insertions(+), 1 deletion(-) + +diff --git a/bson/_cbsonmodule.c b/bson/_cbsonmodule.c +--- a/bson/_cbsonmodule.c ++++ b/bson/_cbsonmodule.c +@@ -2102,5 +2102,8 @@ + case 8: + { ++ if (max < 1) { ++ goto invalid; ++ } + char boolean_raw = buffer[(*position)++]; + if (0 == boolean_raw) { + value = Py_False; +@@ -2290,7 +2290,9 @@ + *position += (unsigned)pattern_length + 1; + start += pattern_length + 1; +- const char* flags_nul = memchr(start, 0, max - pattern_length); ++ /* PYTHON-6111: account for the pattern NUL consumed above so ++ * the flags terminator cannot overlap the document terminator. */ ++ const char* flags_nul = memchr(start, 0, max - pattern_length - 1); + if (!flags_nul) { + Py_DECREF(pattern); + goto invalid; + } +diff --git a/test/test_bson.py b/test/test_bson.py +--- a/test/test_bson.py ++++ b/test/test_bson.py +@@ -438,0 +439,34 @@ class TestBSON(unittest.TestCase): ++ def test_element_overlaps_document_terminator(self): ++ # PYTHON-6111: an element whose value would consume the document ++ # terminator byte must be rejected, matching the pure-Python decoder. ++ bad_bsons = [ ++ # Boolean value byte is the document terminator. ++ ("boolean value", b"\x08\x00\x00\x00\x08a\x00\x00"), ++ # Regex pattern terminator is the document terminator. ++ ("regex pattern", b"\x08\x00\x00\x00\x0ba\x00\x00"), ++ # Regex flags terminator is the document terminator. ++ ("regex flags", b"\x0a\x00\x00\x00\x0ba\x00b\x00\x00"), ++ ] ++ for description, data in bad_bsons: ++ with self.subTest(description, bad_bson=data): ++ self.assertFalse(is_valid(data)) ++ with self.assertRaises(InvalidBSON): ++ decode(data) ++ with self.assertRaises(InvalidBSON): ++ decode(bytearray(data)) ++ with self.assertRaises(InvalidBSON): ++ decode(memoryview(data)) ++ with self.assertRaises(InvalidBSON): ++ decode(array.array("B", data)) ++ with self.assertRaises(InvalidBSON): ++ list(decode_iter(data)) ++ with self.assertRaises(InvalidBSON): ++ decode_all(data) ++ with mmap.mmap(-1, len(data)) as mm: ++ mm.write(data) ++ mm.seek(0) ++ with self.assertRaises(InvalidBSON): ++ decode(mm) ++ with self.assertRaises(InvalidBSON): ++ decode_all(mm) ++ diff --git a/meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435.patch b/meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435.patch new file mode 100644 index 0000000000..688c8fc5b6 --- /dev/null +++ b/meta-python/recipes-devtools/python/python3-pymongo/CVE-2026-106435.patch @@ -0,0 +1,134 @@ +From bb8d4e195275e75bd94ebeffb53cc747d357fcf4 Mon Sep 17 00:00:00 2001 +From: Jeffrey 'Alex' Clark +Date: Thu, 8 Oct 2026 14:45:52 -0400 +Subject: [PATCH] PYTHON-6110 Bound Regex element scans to the remaining + document bytes (#3109) + +Co-authored-by: Steven Silvester + +CVE: CVE-2026-106435 +Upstream-Status: Backport [https://github.com/mongodb/mongo-python-driver/commit/bb8d4e195275e75bd94ebeffb53cc747d357fcf4] + +Backport Changes: +- Added the `struct` import used to update the malformed-regex test's BSON + length prefix. +- Adapted the C hunk to 4.6.3: the new flags-NUL failure path uses the + `Py_DECREF(pattern); goto invalid;` cleanup, and the existing flags-length + size/overflow check remains after the bounded length is computed. Upstream + also removes the `max < pattern_length + flags_length` check. + +Signed-off-by: Yogita Urade +--- + bson/_cbsonmodule.c | 25 ++++++++++++++++++-------- + test/test_bson.py | 46 +++++++++++++++++++++++++++++++++++++++++++++ + 2 files changed, 63 insertions(+), 8 deletions(-) + +diff --git a/bson/_cbsonmodule.c b/bson/_cbsonmodule.c +index da86cd8..6868308 100644 +--- a/bson/_cbsonmodule.c ++++ b/bson/_cbsonmodule.c +@@ -2270,18 +2270,31 @@ static PyObject* get_value(PyObject* self, PyObject* name, const char* buffer, + PyObject* pattern; + int flags; + size_t flags_length, i; +- size_t pattern_length = strlen(buffer + *position); +- if (pattern_length > BSON_MAX_SIZE || max < pattern_length) { ++ /* PYTHON-6110: Search for each NUL within the bytes remaining ++ * in the document rather than scanning the buffer. */ ++ const char* start = buffer + *position; ++ const char* pattern_nul = memchr(start, 0, max); ++ if (!pattern_nul) { ++ goto invalid; ++ } ++ size_t pattern_length = (size_t)(pattern_nul - start); ++ if (pattern_length > BSON_MAX_SIZE) { + goto invalid; + } + pattern = PyUnicode_DecodeUTF8( +- buffer + *position, pattern_length, ++ start, pattern_length, + options->unicode_decode_error_handler); + if (!pattern) { + goto invalid; + } + *position += (unsigned)pattern_length + 1; +- flags_length = strlen(buffer + *position); ++ start += pattern_length + 1; ++ const char* flags_nul = memchr(start, 0, max - pattern_length); ++ if (!flags_nul) { ++ Py_DECREF(pattern); ++ goto invalid; ++ } ++ flags_length = (size_t)(flags_nul - start); + if (flags_length > BSON_MAX_SIZE || + (BSON_MAX_SIZE - pattern_length) < flags_length) { + Py_DECREF(pattern); +@@ -2288,10 +2301,6 @@ + goto invalid; + } +- if (max < pattern_length + flags_length) { +- Py_DECREF(pattern); +- goto invalid; +- } + flags = 0; + for (i = 0; i < flags_length; i++) { + if (buffer[*position + i] == 'i') { + flags |= 2; +diff --git a/test/test_bson.py b/test/test_bson.py +index 749c63b..483facf 100644 +--- a/test/test_bson.py ++++ b/test/test_bson.py +@@ -23,6 +23,7 @@ import mmap + import os + import pickle + import re ++import struct + import sys + import tempfile + import uuid +@@ -392,0 +393,45 @@ class TestBSON(unittest.TestCase): ++ def test_malformed_regex(self): ++ # PYTHON-6110: decoding a malformed Regex element must raise ++ # InvalidBSON on every accepted buffer type. ++ malformed = [] ++ for pattern in ("", "x", "xx"): ++ doc = bytearray(encode({"a": Regex(pattern, "")})) ++ # Drop the trailing flags NUL and document EOO bytes, leaving ++ # the flags string unterminated after the pattern's NUL. ++ del doc[-2:] ++ # Keep the length prefix consistent with the shorter document. ++ doc[:4] = struct.pack("