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Devansh Patel
b8bd073f05
Scarthgap already contains 4810cd8c5b [3], which backports
fb4ee161 and e61a5f36 for read-ahead/read-size handling. The
associated submission [4] labels that work as CVE-2026-26209, but
it does not add the max_depth protection required for uncontrolled
recursion [2].
Complete the existing backport with the 5.9.0 max-depth chain:
- bcb6cea4: add the C decoder depth limit [1]
- 94e0d212: add the security-essential pure-Python depth limit
- 53521e7c: apply the required type correction
- a7ac10d5: raise the default depth limit to 400
- d903d62c: synchronize the C function signature default
The 5.9.0 upgrade description [5] also identifies max_depth as the
CVE fix. Full upstream commit links are recorded in the embedded
patch headers.
[1] https://github.com/agronholm/cbor2/commit/bcb6cea4edde1d00ff4f0eece883dea951f66e1b
[2] https://github.com/advisories/GHSA-3c37-wwvx-h642
[3] https://git.openembedded.org/meta-openembedded/commit/?id=4810cd8c5bbc0b4349a78eac85a6a882bc0b03a2
[4] https://www.mail-archive.com/openembedded-devel%40lists.openembedded.org/msg105607.html
[5] https://www.mail-archive.com/openembedded-devel%40lists.openembedded.org/msg105418.html
Signed-off-by: Devansh Patel <devanshp@cisco.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
82 lines
2.7 KiB
Diff
82 lines
2.7 KiB
Diff
From 3aa613d4b3ec1ed78dcaf5577cea867309d228c8 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Alex=20Gr=C3=B6nholm?= <alex.gronholm@nextday.fi>
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Date: Sat, 21 Mar 2026 23:48:20 +0200
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Subject: [PATCH] Upped the max_depth value to 400
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CVE: CVE-2026-26209
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Upstream-Status: Backport [https://github.com/agronholm/cbor2/commit/a7ac10d5cbb7a8622e8270c201a131ac2abc26c7]
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Backport Changes:
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- Omitted docs/versionhistory.rst after it failed to cherry-pick because
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Scarthgap 5.6.4 lacks the later release sections; all source and test
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changes are retained.
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(cherry picked from commit a7ac10d5cbb7a8622e8270c201a131ac2abc26c7)
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Signed-off-by: Devansh Patel <devanshp@cisco.com>
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---
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cbor2/_decoder.py | 6 +++---
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source/decoder.h | 2 +-
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tests/test_decoder.py | 4 ++--
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3 files changed, 6 insertions(+), 6 deletions(-)
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diff --git a/cbor2/_decoder.py b/cbor2/_decoder.py
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index 024c403..cccd0ac 100644
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--- a/cbor2/_decoder.py
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+++ b/cbor2/_decoder.py
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@@ -75,7 +75,7 @@ class CBORDecoder:
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str_errors: Literal["strict", "error", "replace"] = "strict",
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read_size: int = 1,
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*,
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- max_depth: int = 100,
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+ max_depth: int = 400,
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):
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"""
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:param fp:
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@@ -817,7 +817,7 @@ def loads(
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str_errors: Literal["strict", "error", "replace"] = "strict",
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read_size: int = 1,
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*,
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- max_depth: int = 100,
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+ max_depth: int = 400,
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) -> Any:
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"""
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Deserialize an object from a bytestring.
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@@ -866,7 +866,7 @@ def load(
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str_errors: Literal["strict", "error", "replace"] = "strict",
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read_size: int = 1,
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*,
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- max_depth: int = 100,
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+ max_depth: int = 400,
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) -> Any:
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"""
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Deserialize an object from an open file.
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diff --git a/source/decoder.h b/source/decoder.h
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index c4ef1c1..2989fc1 100644
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--- a/source/decoder.h
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+++ b/source/decoder.h
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@@ -6,7 +6,7 @@
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// Default readahead buffer size for streaming reads.
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// Set to 1 for backwards compatibility (no buffering).
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#define CBOR2_DEFAULT_READ_SIZE 1
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-#define CBOR2_DEFAULT_MAX_DEPTH 100
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+#define CBOR2_DEFAULT_MAX_DEPTH 400
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// Forward declaration for function pointer typedef
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struct CBORDecoderObject_;
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diff --git a/tests/test_decoder.py b/tests/test_decoder.py
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index 5a90adf..9e33ded 100644
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--- a/tests/test_decoder.py
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+++ b/tests/test_decoder.py
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@@ -142,9 +142,9 @@ class TestMaximumDepth:
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def test_default(self, impl) -> None:
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with pytest.raises(
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impl.CBORDecodeError,
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- match="maximum container nesting depth \\(100\\) exceeded",
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+ match="maximum container nesting depth \\(400\\) exceeded",
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):
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- impl.loads(b"\x81" * 101 + b"\x80")
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+ impl.loads(b"\x81" * 401 + b"\x80")
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def test_explicit(self, impl) -> None:
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with pytest.raises(
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