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Security fixes for CVE-2026-4786, CVE-2026-6100

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Resolves: RHEL-168129, RHEL-167891
This commit is contained in:
Charalampos Stratakis 2026-04-17 03:41:06 +02:00
parent e7a2b30508
commit 91083a10c7
3 changed files with 128 additions and 1 deletions
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63
00480-cve-2026-4786.patch Normal file
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@ -0,0 +1,63 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Stan Ulbrych <stan@python.org>
Date: Mon, 13 Apr 2026 22:41:51 +0100
Subject: 00480: CVE-2026-4786
Fix webbrowser `%action` substitution bypass of dash-prefix check
---
Lib/test/test_webbrowser.py | 8 ++++++++
Lib/webbrowser.py | 5 +++--
.../2026-03-31-09-15-51.gh-issue-148169.EZJzz2.rst | 2 ++
3 files changed, 13 insertions(+), 2 deletions(-)
create mode 100644 Misc/NEWS.d/next/Security/2026-03-31-09-15-51.gh-issue-148169.EZJzz2.rst
diff --git a/Lib/test/test_webbrowser.py b/Lib/test/test_webbrowser.py
index 0ac985f56c..d629f889db 100644
--- a/Lib/test/test_webbrowser.py
+++ b/Lib/test/test_webbrowser.py
@@ -99,6 +99,14 @@ def test_open_new_tab(self):
options=[],
arguments=[URL])
+ def test_reject_action_dash_prefixes(self):
+ browser = self.browser_class(name=CMD_NAME)
+ with self.assertRaises(ValueError):
+ browser.open('%action--incognito')
+ # new=1: action is "--new-window", so "%action" itself expands to
+ # a dash-prefixed flag even with no dash in the original URL.
+ with self.assertRaises(ValueError):
+ browser.open('%action', new=1)
class MozillaCommandTest(CommandTestMixin, unittest.TestCase):
diff --git a/Lib/webbrowser.py b/Lib/webbrowser.py
index 0fd0aeb3c1..026bdfbd7b 100755
--- a/Lib/webbrowser.py
+++ b/Lib/webbrowser.py
@@ -265,7 +265,6 @@ def _invoke(self, args, remote, autoraise, url=None):
def open(self, url, new=0, autoraise=True):
sys.audit("webbrowser.open", url)
- self._check_url(url)
if new == 0:
action = self.remote_action
elif new == 1:
@@ -279,7 +278,9 @@ def open(self, url, new=0, autoraise=True):
raise Error("Bad 'new' parameter to open(); " +
"expected 0, 1, or 2, got %s" % new)
- args = [arg.replace("%s", url).replace("%action", action)
+ self._check_url(url.replace("%action", action))
+
+ args = [arg.replace("%action", action).replace("%s", url)
for arg in self.remote_args]
args = [arg for arg in args if arg]
success = self._invoke(args, True, autoraise, url)
diff --git a/Misc/NEWS.d/next/Security/2026-03-31-09-15-51.gh-issue-148169.EZJzz2.rst b/Misc/NEWS.d/next/Security/2026-03-31-09-15-51.gh-issue-148169.EZJzz2.rst
new file mode 100644
index 0000000000..45cdeebe1b
--- /dev/null
+++ b/Misc/NEWS.d/next/Security/2026-03-31-09-15-51.gh-issue-148169.EZJzz2.rst
@@ -0,0 +1,2 @@
+A bypass in :mod:`webbrowser` allowed URLs prefixed with ``%action`` to pass
+the dash-prefix safety check.

48
00482-cve-2026-6100.patch Normal file
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@ -0,0 +1,48 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Stan Ulbrych <stan@python.org>
Date: Mon, 13 Apr 2026 22:42:36 +0100
Subject: 00482: CVE-2026-6100
Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor
---
.../Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst | 5 +++++
Modules/_bz2module.c | 1 +
Modules/_lzmamodule.c | 1 +
3 files changed, 7 insertions(+)
create mode 100644 Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst
diff --git a/Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst b/Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst
new file mode 100644
index 0000000000..349d1cf3ca
--- /dev/null
+++ b/Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst
@@ -0,0 +1,5 @@
+Fix a dangling input pointer in :class:`lzma.LZMADecompressor`,
+and :class:`bz2.BZ2Decompressor`
+when memory allocation fails with :exc:`MemoryError`, which could let a
+subsequent :meth:`!decompress` call read or write through a stale pointer to
+the already-released caller buffer.
diff --git a/Modules/_bz2module.c b/Modules/_bz2module.c
index 798e9efc62..b08ac5e44e 100644
--- a/Modules/_bz2module.c
+++ b/Modules/_bz2module.c
@@ -595,6 +595,7 @@ decompress(BZ2Decompressor *d, char *data, size_t len, Py_ssize_t max_length)
return result;
error:
+ bzs->next_in = NULL;
Py_XDECREF(result);
return NULL;
}
diff --git a/Modules/_lzmamodule.c b/Modules/_lzmamodule.c
index 97453a2808..51106a6a07 100644
--- a/Modules/_lzmamodule.c
+++ b/Modules/_lzmamodule.c
@@ -1105,6 +1105,7 @@ decompress(Decompressor *d, uint8_t *data, size_t len, Py_ssize_t max_length)
return result;
error:
+ lzs->next_in = NULL;
Py_XDECREF(result);
return NULL;
}

18
python3.11.spec
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@ -20,7 +20,7 @@ URL: https://www.python.org/
#global prerel ...
%global upstream_version %{general_version}%{?prerel}
Version: %{general_version}%{?prerel:~%{prerel}}
Release: 6%{?dist}
Release: 7%{?dist}
License: Python
@ -462,6 +462,18 @@ Patch476: 00476-cve-2026-1299.patch
# Reject leading dashes in webbrowser URLs (GH-143931) (GH-146364)
Patch478: 00478-cve-2026-4519.patch
# 00480 # 9f4b1483ecfbc8c08117133c239fba544fcb42e7
# CVE-2026-4786
#
# Fix webbrowser `%%action` substitution bypass of dash-prefix check
Patch480: 00480-cve-2026-4786.patch
# 00482 # 2a21454e658935990766df8c3c48af9363e8422a
# CVE-2026-6100
#
# Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor
Patch482: 00482-cve-2026-6100.patch
# (New patches go here ^^^)
#
# When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@ -1919,6 +1931,10 @@ fi
# ======================================================
%changelog
* Fri Apr 17 2026 Charalampos Stratakis <cstratak@redhat.com> - 3.11.13-7
- Security fixes for CVE-2026-4786, CVE-2026-6100
Resolves: RHEL-168129, RHEL-167891
* Thu Mar 26 2026 Lukáš Zachar <lzachar@redhat.com> - 3.11.13-6
- Security fix for CVE-2026-4519
Resolves: RHEL-158028