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Update to 0.6.3

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Update License to BSD-2-Clause to match upstream SPDX identifier
Added nesting depth limit to ASN.1 decoder (CVE-2026-30922)
Fixed continuation octet limits in OID/RELATIVE-OID decoder (CVE-2026-23490)

Resolves: RHEL-170862
This commit is contained in:
Simon Pichugin 2026-04-23 17:50:22 -07:00
parent d003c0b5e6
commit e58db0c224
6 changed files with 190 additions and 169 deletions
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29
.gitignore vendored
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@ -1,26 +1,3 @@
pyasn1-0.0.9a.tar.gz /pyasn1-*.tar.gz
/pyasn1-0.0.12a.tar.gz /pyasn1-modules-*.tar.gz
/pyasn1-0.1.2.tar.gz /v*.tar.gz
/pyasn1-modules-0.0.2.tar.gz
/pyasn1-0.1.6.tar.gz
/pyasn1-modules-0.0.4.tar.gz
/pyasn1-0.1.7.tar.gz
/pyasn1-modules-0.0.5.tar.gz
/pyasn1-0.1.8.tar.gz
/pyasn1-modules-0.0.6.tar.gz
/pyasn1-modules-0.0.8.tar.gz
/pyasn1-0.1.9.tar.gz
/v0.2.1.tar.gz
/v0.2.3.tar.gz
/v0.3.2.tar.gz
/v0.0.11.tar.gz
/v0.3.4.tar.gz
/v0.1.2.tar.gz
/v0.1.5.tar.gz
/v0.3.7.tar.gz
/v0.4.4.tar.gz
/v0.2.2.tar.gz
/v0.2.6.tar.gz
/v0.4.6.tar.gz
/v0.4.8.tar.gz
/v0.2.8.tar.gz

122
0001-Backport-commit-be353d7.patch
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@ -1,122 +0,0 @@
From eb5017870dd6c96c1994a1b94150237e68edb179 Mon Sep 17 00:00:00 2001
From: Florence Blanc-Renaud <flo@redhat.com>
Date: Thu, 12 Feb 2026 23:18:56 +0100
Subject: [PATCH] Backport commit be353d7
Add limit of 20 continuation octets per OID arc to prevent a potential memory
exhaustion from excessive continuation bytes input.
---
pyasn1/codec/ber/decoder.py | 11 ++++++
tests/codec/ber/test_decoder.py | 66 +++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)
diff --git a/pyasn1/codec/ber/decoder.py b/pyasn1/codec/ber/decoder.py
index 5ff485fbeb0cc7d761dd398134cf39a6258a109e..adfd7501a52421748b3143935a0ec95bdd1d42e6 100644
--- a/pyasn1/codec/ber/decoder.py
+++ b/pyasn1/codec/ber/decoder.py
@@ -22,6 +22,10 @@ LOG = debug.registerLoggee(__name__, flags=debug.DEBUG_DECODER)
noValue = base.noValue
+# Maximum number of continuation octets (high-bit set) allowed per OID arc.
+# 20 octets allows up to 140-bit integers, supporting UUID-based OIDs
+MAX_OID_ARC_CONTINUATION_OCTETS = 20
+
class AbstractDecoder(object):
protoComponent = None
@@ -342,7 +346,14 @@ class ObjectIdentifierDecoder(AbstractSimpleDecoder):
# Construct subid from a number of octets
nextSubId = subId
subId = 0
+ continuationOctetCount = 0
while nextSubId >= 128:
+ continuationOctetCount += 1
+ if continuationOctetCount > MAX_OID_ARC_CONTINUATION_OCTETS:
+ raise error.PyAsn1Error(
+ 'OID arc exceeds maximum continuation octets limit (%d) '
+ 'at position %d' % (MAX_OID_ARC_CONTINUATION_OCTETS, index)
+ )
subId = (subId << 7) + (nextSubId & 0x7F)
if index >= substrateLen:
raise error.SubstrateUnderrunError(
diff --git a/tests/codec/ber/test_decoder.py b/tests/codec/ber/test_decoder.py
index e3b74dfd203923157cb6a26215e9d03c971a5b41..f9bf381b1da339611d974673420248e1a1014421 100644
--- a/tests/codec/ber/test_decoder.py
+++ b/tests/codec/ber/test_decoder.py
@@ -407,6 +407,72 @@ class ObjectIdentifierDecoderTestCase(BaseTestCase):
ints2octs((0x06, 0x13, 0x88, 0x37, 0x83, 0xC6, 0xDF, 0xD4, 0xCC, 0xB3, 0xFF, 0xFF, 0xFE, 0xF0, 0xB8, 0xD6, 0xB8, 0xCB, 0xE2, 0xB6, 0x47))
) == ((2, 999, 18446744073709551535184467440737095), null)
+ def testExcessiveContinuationOctets(self):
+ """Test that OID arcs with excessive continuation octets are rejected."""
+ # Create a payload with 25 continuation octets (exceeds 20 limit)
+ # 0x81 bytes are continuation octets, 0x01 terminates
+ malicious_payload = bytes([0x06, 26]) + bytes([0x81] * 25) + bytes([0x01])
+ try:
+ decoder.decode(malicious_payload)
+ except PyAsn1Error:
+ pass
+ else:
+ assert 0, 'Excessive continuation octets tolerated'
+
+ def testMaxAllowedContinuationOctets(self):
+ """Test that OID arcs at the maximum continuation octets limit work."""
+ # Create a payload with exactly 20 continuation octets (at limit)
+ # This should succeed
+ payload = bytes([0x06, 21]) + bytes([0x81] * 20) + bytes([0x01])
+ try:
+ decoder.decode(payload)
+ except PyAsn1Error:
+ assert 0, 'Valid OID with 20 continuation octets rejected'
+
+ def testOneOverContinuationLimit(self):
+ """Test boundary: 21 continuation octets (one over limit) is rejected."""
+ payload = bytes([0x06, 22]) + bytes([0x81] * 21) + bytes([0x01])
+ try:
+ decoder.decode(payload)
+ except PyAsn1Error:
+ pass
+ else:
+ assert 0, '21 continuation octets tolerated (should be rejected)'
+
+ def testExcessiveContinuationInSecondArc(self):
+ """Test that limit applies to subsequent arcs, not just the first."""
+ # First arc: valid simple byte (0x55 = 85, decodes to arc 2.5)
+ # Second arc: excessive continuation octets
+ payload = bytes([0x06, 27]) + bytes([0x55]) + bytes([0x81] * 25) + bytes([0x01])
+ try:
+ decoder.decode(payload)
+ except PyAsn1Error:
+ pass
+ else:
+ assert 0, 'Excessive continuation in second arc tolerated'
+
+ def testMultipleArcsAtLimit(self):
+ """Test multiple arcs each at the continuation limit work correctly."""
+ # Two arcs, each with 20 continuation octets (both at limit)
+ arc1 = bytes([0x81] * 20) + bytes([0x01]) # 21 bytes
+ arc2 = bytes([0x81] * 20) + bytes([0x01]) # 21 bytes
+ payload = bytes([0x06, 42]) + arc1 + arc2
+ try:
+ decoder.decode(payload)
+ except PyAsn1Error:
+ assert 0, 'Multiple valid arcs at limit rejected'
+
+ def testExcessiveContinuationWithMaxBytes(self):
+ """Test with 0xFF continuation bytes (maximum value, not just 0x81)."""
+ # 0xFF bytes are also continuation octets (high bit set)
+ malicious_payload = bytes([0x06, 26]) + bytes([0xFF] * 25) + bytes([0x01])
+ try:
+ decoder.decode(malicious_payload)
+ except PyAsn1Error:
+ pass
+ else:
+ assert 0, 'Excessive 0xFF continuation octets tolerated'
+
class RealDecoderTestCase(BaseTestCase):
def testChar(self):
--
2.52.0

158
0001-Revert-Package-pyasn1-with-pyproject.toml-90.patch Normal file
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@ -0,0 +1,158 @@
From 66bcd08ebf586742ca3dd857ec29f490eac2b242 Mon Sep 17 00:00:00 2001
From: Simon Pichugin <spichugi@redhat.com>
Date: Mon, 27 Apr 2026 20:34:28 -0700
Subject: [PATCH] Revert "Package pyasn1 with pyproject.toml (#90)"
This reverts commit d2015ad04336944511ce7643914e8daf432ef2f9.
It's a modified patch because the release tarball already contains a setup.cfg
with [egg_info] content; this patch prepends the full [metadata] and [options]
sections so that EL9's older setuptools can read the package name/version correctly
and produce a properly-named wheel instead of UNKNOWN-0.0.0.
---
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,68 +4,3 @@
]
build-backend = "setuptools.build_meta"
-[project]
-name = "pyasn1"
-license.text = "BSD-2-Clause" # Replace with 'license' once Python 3.8 is dropped
-description = "Pure-Python implementation of ASN.1 types and DER/BER/CER codecs (X.208)"
-readme = "README.md"
-authors = [
- {name = "Ilya Etingof", email = "etingof@gmail.com"}
-]
-maintainers = [
- {name = "pyasn1 maintenance organization"},
- {name = "Christian Heimes", email = "christian@python.org"}
-]
-requires-python = ">=3.8"
-classifiers = [
- "Development Status :: 5 - Production/Stable",
- "Environment :: Console",
- "Intended Audience :: Developers",
- "Intended Audience :: Education",
- "Intended Audience :: Information Technology",
- "Intended Audience :: System Administrators",
- "Intended Audience :: Telecommunications Industry",
- "Natural Language :: English",
- "Operating System :: OS Independent",
- "Programming Language :: Python :: 3",
- "Programming Language :: Python :: 3.8",
- "Programming Language :: Python :: 3.9",
- "Programming Language :: Python :: 3.10",
- "Programming Language :: Python :: 3.11",
- "Programming Language :: Python :: 3.12",
- "Programming Language :: Python :: 3.13",
- "Programming Language :: Python :: 3.14",
- "Programming Language :: Python :: Implementation :: CPython",
- "Programming Language :: Python :: Implementation :: PyPy",
- "Topic :: Communications",
- "Topic :: Software Development :: Libraries :: Python Modules"
-]
-dynamic = ["version"]
-
-[project.urls]
-"Homepage" = "https://github.com/pyasn1/pyasn1"
-"Documentation" = "https://pyasn1.readthedocs.io"
-"Source" = "https://github.com/pyasn1/pyasn1"
-"Issues" = "https://github.com/pyasn1/pyasn1/issues"
-"Changelog" = "https://pyasn1.readthedocs.io/en/latest/changelog.html"
-
-[tool.setuptools]
-zip-safe = true
-platforms = ["any"]
-# Additional files to include in the distribution (replaces MANIFEST.in functionality)
-include-package-data = true
-license-files = ["LICENSE.rst"] # Replace with 'project.license-files' once Python 3.8 is dropped
-
-[tool.setuptools.dynamic]
-version = {attr = "pyasn1.__version__"}
-
-[tool.setuptools.packages.find]
-include = [
- "pyasn1*"
-]
-
-[tool.setuptools.package-data]
-"*" = [
- "*.rst",
- "*.md"
-]
--- a/setup.cfg
+++ b/setup.cfg
@@ -0,0 +1,56 @@
+[metadata]
+name = pyasn1
+version = attr: pyasn1.__version__
+description = Pure-Python implementation of ASN.1 types and DER/BER/CER codecs (X.208)
+long_description = file: README.md
+long_description_content_type = text/markdown
+license = BSD-2-Clause
+license_files = LICENSE.rst
+url = https://github.com/pyasn1/pyasn1
+author = Ilya Etingof
+author_email = etingof@gmail.com
+maintainer = pyasn1 maintenance organization
+maintainer_email = Christian Heimes <christian@python.org>
+project_urls =
+ Documentation=https://pyasn1.readthedocs.io
+ Source=https://github.com/pyasn1/pyasn1
+ Issues=https://github.com/pyasn1/pyasn1/issues
+ Changelog=https://pyasn1.readthedocs.io/en/latest/changelog.html
+platforms = any
+classifiers =
+ Development Status :: 5 - Production/Stable
+ Environment :: Console
+ Intended Audience :: Developers
+ Intended Audience :: Education
+ Intended Audience :: Information Technology
+ Intended Audience :: System Administrators
+ Intended Audience :: Telecommunications Industry
+ License :: OSI Approved :: BSD License
+ Natural Language :: English
+ Operating System :: OS Independent
+ Programming Language :: Python :: 3
+ Programming Language :: Python :: 3.8
+ Programming Language :: Python :: 3.9
+ Programming Language :: Python :: 3.10
+ Programming Language :: Python :: 3.11
+ Programming Language :: Python :: 3.12
+ Programming Language :: Python :: 3.13
+ Programming Language :: Python :: Implementation :: CPython
+ Programming Language :: Python :: Implementation :: PyPy
+ Topic :: Communications
+ Topic :: Software Development :: Libraries :: Python Modules
+
+[options]
+python_requires = >=3.8
+zip_safe = True
+setup_requires = setuptools
+packages =
+ pyasn1
+ pyasn1.type
+ pyasn1.compat
+ pyasn1.codec
+ pyasn1.codec.ber
+ pyasn1.codec.cer
+ pyasn1.codec.der
+ pyasn1.codec.native
+
--- a/setup.py
+++ b/setup.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+#
+# This file is part of pyasn1 software.
+#
+# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com>
+# License: https://pyasn1.readthedocs.io/en/latest/license.html
+#
+from setuptools import setup
+
+setup()
--
2.52.0

32
python-pyasn1.spec
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@ -1,18 +1,18 @@
%global module pyasn1 %global module pyasn1
%global modules_version 0.2.8 %global modules_version 0.4.2
Name: python-pyasn1 Name: python-pyasn1
Version: 0.4.8 Version: 0.6.3
Release: 7%{?dist} Release: 1%{?dist}
Summary: ASN.1 tools for Python Summary: ASN.1 tools for Python
License: BSD License: BSD-2-Clause
Source0: https://github.com/etingof/pyasn1/archive/v%{version}.tar.gz Source0: https://github.com/pyasn1/pyasn1/archive/v%{version}.tar.gz
Source1: https://github.com/etingof/pyasn1-modules/archive/v%{modules_version}.tar.gz Source1: https://github.com/pyasn1/pyasn1-modules/archive/v%{modules_version}.tar.gz
URL: http://pyasn1.sourceforge.net/ URL: https://github.com/pyasn1/pyasn1
BuildArch: noarch BuildArch: noarch
# Revert upstream migration to pyproject.toml [project] metadata (PR#90);
Patch1: 0001-Backport-commit-be353d7.patch # EL9 ships setuptools too old to handle it, producing an UNKNOWN-0.0.0 wheel.
Patch0: 0001-Revert-Package-pyasn1-with-pyproject.toml-90.patch
%description %description
This is an implementation of ASN.1 types and codecs in the Python programming This is an implementation of ASN.1 types and codecs in the Python programming
@ -58,7 +58,7 @@ pushd ../pyasn1-modules-%{modules_version}
popd popd
pushd docs pushd docs
PYTHONPATH=%{buildroot}%{python3_sitelib} make SPHINXBUILD=sphinx-build-3 html PYTHONPATH=.. make SPHINXBUILD=sphinx-build-3 html
popd popd
@ -71,7 +71,8 @@ popd
%check %check
PYTHONPATH=%{buildroot}%{python3_sitelib} %{__python3} setup.py test cd %{_builddir}/%{module}-%{version}
PYTHONPATH=%{buildroot}%{python3_sitelib} %{__python3} -m tests
%files -n python3-pyasn1 %files -n python3-pyasn1
@ -89,6 +90,13 @@ PYTHONPATH=%{buildroot}%{python3_sitelib} %{__python3} setup.py test
%doc docs/build/html/* %doc docs/build/html/*
%changelog %changelog
* Fri Apr 24 2026 Simon Pichugin <spichugi@redhat.com> - 0.6.3-1
- Update to 0.6.3
- Update License to BSD-2-Clause to match upstream SPDX identifier
- Added nesting depth limit to ASN.1 decoder (CVE-2026-30922)
- Fixed continuation octet limits in OID/RELATIVE-OID decoder (CVE-2026-23490)
- Resolves: RHEL-170862
* Fri Feb 13 2026 Florence Blanc-Renaud <flo@redhat.com> - 0.4.8-7 * Fri Feb 13 2026 Florence Blanc-Renaud <flo@redhat.com> - 0.4.8-7
- Resolves: RHEL-148154 - Resolves: RHEL-148154

4
sources
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@ -1,2 +1,2 @@
SHA512 (v0.4.8.tar.gz) = 3bd2f51c8f9f1f3ba48464622370bb7e7c9eda63d9cd2ef2fd6b6bbcd916a439c053febab2535f5fb6120d0ce87d7aa3c9c8756809db73502b5cf7c7a2048a6d SHA512 (v0.6.3.tar.gz) = c58962b3f11f486da3e73c09dbe2aff7500879b29c4a7be4295878e4edbcaaa2680d608720ad5af86a2457de7da50471ab7a9e925f717db5c467553fc552e6d6
SHA512 (v0.2.8.tar.gz) = 7701f239c13e65d5a0979b0d3ac4a408e9493dfdbb2277d864a6c204ea8dc569cddbbaba2e9a601c86336a02af660a6dfeb734f70c6f73631443219b2e770047 SHA512 (v0.4.2.tar.gz) = 7c4feab23a8c5ab72549387586894d1d53a3ad8b9d12cc5774b1d1f5192873f87da2e3525059fdda5b5884a52908ce79df274e3b75ee1f42af32e83ceb3f9167

14
tests/tests.yml
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@ -13,15 +13,15 @@
required_packages: required_packages:
- python3-pyasn1 - python3-pyasn1
- python3-pyasn1-modules - python3-pyasn1-modules
- python3-pytest
tests: tests:
- unittests-pyasn1: - unittests-pyasn1:
dir: "source/pyasn1-0.4.8" # Must match the unpacked tarball directory name from this SRPM (see sources / spec Version).
dir: "source/pyasn1-0.6.3"
run: >- run: >-
rm -rf pyasn1* && rm -rf pyasn1 &&
pytest-3 tests/ python3 -m tests
- unittests-pyasn1-modules: - unittests-pyasn1-modules:
dir: "source/pyasn1-modules-0.2.8" dir: "source/pyasn1-modules-0.4.2"
run: >- run: >-
rm -rf pyasn1_modules* && rm -rf pyasn1_modules &&
pytest-3 tests/ python3 -m tests