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Fix CVE-2026-52858: possible code execution with python3complete

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Backport fix for CVE-2026-52858 to vim on c8s. Two upstream
patches are applied:

- Patch 3059 (upstream 9.2.0561): Disables execution of
  import/from statements in python3complete.vim and
  pythoncomplete.vim unless g:pythoncomplete_allow_import
  is explicitly set by the user.
- Patch 3060 (upstream 9.2.0568): Follow-up fix adding
  missing 'import vim' in evalsource() so the opt-in
  variable is actually honored.

Both patches had src/version.c hunks stripped per
maintainer rules. Minor conflicts in filetype.txt and
test_popup.vim were resolved manually due to differences
between vim 8.0 and upstream.

CVE: CVE-2026-52858
Upstream patches:
 - 4b850457e1.patch
 - 868ad62cb8.patch
Resolves: RHEL-186648

This commit was backported by Ymir, a Red Hat Enterprise Linux software maintenance AI agent.

Assisted-by: Ymir
This commit is contained in:
RHEL Packaging Agent 2026-06-23 21:22:41 +00:00 committed by Zdenek Dohnal
parent 9aca0db7e7
commit 4e3ff3d4fe
3 changed files with 239 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

141
0001-patch-9.2.0561-security-possible-code-execution-with.patch Normal file
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@ -0,0 +1,141 @@
From d883881dfd546a59763be7bb253ac1165b6b5256 Mon Sep 17 00:00:00 2001
From: Christian Brabandt <cb@256bit.org>
Date: Fri, 29 May 2026 19:05:53 +0000
Subject: [PATCH] patch 9.2.0561: [security]: possible code execution with
python3complete
Problem: [security]: possible code execution with python3complete
Solution: Disable execution of import/from statements
Github Security Advisory:
https://github.com/vim/vim/security/advisories/GHSA-52mc-rq6p-rc7c
Signed-off-by: Christian Brabandt <cb@256bit.org>
---
runtime/autoload/README.txt | 1 +
runtime/autoload/python3complete.vim | 13 ++++++++++---
runtime/autoload/pythoncomplete.vim | 13 ++++++++++---
runtime/doc/filetype.txt | 15 ++++++++++++++-
4 files changed, 35 insertions(+), 7 deletions(-)
diff --git a/runtime/autoload/README.txt b/runtime/autoload/README.txt
index 3b18d3d..b225819 100644
--- a/runtime/autoload/README.txt
+++ b/runtime/autoload/README.txt
@@ -17,6 +17,7 @@ htmlcomplete.vim HTML
javascriptcomplete.vim Javascript
phpcomplete.vim PHP
pythoncomplete.vim Python
+python3complete.vim Python
rubycomplete.vim Ruby
syntaxcomplete.vim from syntax highlighting
xmlcomplete.vim XML (uses files in the xml directory)
diff --git a/runtime/autoload/python3complete.vim b/runtime/autoload/python3complete.vim
index f0f3aad..5dcfb73 100644
--- a/runtime/autoload/python3complete.vim
+++ b/runtime/autoload/python3complete.vim
@@ -128,11 +128,20 @@ class Completer(object):
def evalsource(self,text,line=0):
sc = self.parser.parse(text,line)
+ try: allow_imports = int(
+ vim.eval("get(g:, 'pythoncomplete_allow_import', 0)"))
+ except Exception:
+ allow_imports = 0
src = sc.get_code()
dbg("source: %s" % src)
try: exec(src,self.compldict)
except: dbg("parser: %s, %s" % (sys.exc_info()[0],sys.exc_info()[1]))
for l in sc.locals:
+ # Executing import/from statements harvested from the buffer runs
+ # arbitrary package code; only do so when the user opted in.
+ if not allow_imports and (l.startswith('import')
+ or l.startswith('from ')):
+ continue
try: exec(l,self.compldict)
except: dbg("locals: %s, %s [%s]" % (sys.exc_info()[0],sys.exc_info()[1],l))
@@ -296,13 +305,11 @@ class Scope(object):
def get_code(self):
str = ""
if len(self.docstr) > 0: str += '"""'+self.docstr+'"""\n'
- for l in self.locals:
- if l.startswith('import'): str += l+'\n'
str += 'class _PyCmplNoType:\n def __getattr__(self,name):\n return None\n'
for sub in self.subscopes:
str += sub.get_code()
for l in self.locals:
- if not l.startswith('import'): str += l+'\n'
+ if not l.startswith('import') and not l.startswith('from '): str += l+'\n'
return str
diff --git a/runtime/autoload/pythoncomplete.vim b/runtime/autoload/pythoncomplete.vim
index ecc3664..6f72b11 100644
--- a/runtime/autoload/pythoncomplete.vim
+++ b/runtime/autoload/pythoncomplete.vim
@@ -145,11 +145,20 @@ class Completer(object):
def evalsource(self,text,line=0):
sc = self.parser.parse(text,line)
+ try: allow_imports = int(
+ vim.eval("get(g:, 'pythoncomplete_allow_import', 0)"))
+ except Exception:
+ allow_imports = 0
src = sc.get_code()
dbg("source: %s" % src)
try: exec(src) in self.compldict
except: dbg("parser: %s, %s" % (sys.exc_info()[0],sys.exc_info()[1]))
for l in sc.locals:
+ # Executing import/from statements harvested from the buffer runs
+ # arbitrary package code; only do so when the user opted in.
+ if not allow_imports and (l.startswith('import')
+ or l.startswith('from ')):
+ continue
try: exec(l) in self.compldict
except: dbg("locals: %s, %s [%s]" % (sys.exc_info()[0],sys.exc_info()[1],l))
@@ -314,13 +323,11 @@ class Scope(object):
def get_code(self):
str = ""
if len(self.docstr) > 0: str += '"""'+self.docstr+'"""\n'
- for l in self.locals:
- if l.startswith('import'): str += l+'\n'
str += 'class _PyCmplNoType:\n def __getattr__(self,name):\n return None\n'
for sub in self.subscopes:
str += sub.get_code()
for l in self.locals:
- if not l.startswith('import'): str += l+'\n'
+ if not l.startswith('import') and not l.startswith('from '): str += l+'\n'
return str
diff --git a/runtime/doc/filetype.txt b/runtime/doc/filetype.txt
index a5f2a1c..8ebe52a 100644
--- a/runtime/doc/filetype.txt
+++ b/runtime/doc/filetype.txt
@@ -641,7 +641,20 @@ By default the following options are set, in accordance with PEP8: >
To disable this behaviour, set the following variable in your vimrc: >
let g:python_recommended_style = 0
-
+<
+Python omni-completion |compl-omni| is provided by python3complete.vim (or
+pythoncomplete.vim) for Vim builds with the |+python|/|+python3| interpreter.
+By default it does not inspect the import / from statements found in the
+buffer. This means completion of names defined in the buffer itself (classes,
+functions, variables) works, but completion of members of imported modules is
+not offered.
+
+To enable completion of imported module members, set: >
+ let g:pythoncomplete_allow_import = 1
+<
+WARNING: enabling this causes omni-completion to execute the import statements
+found in the buffer through Python's import machinery, which runs the imported
+modules' top-level code. Only enable this for code you trust.
RPM SPEC *ft-spec-plugin*
--
2.52.0

87
0001-patch-9.2.0568-pythoncomplete-g-pythoncomplete_allow.patch Normal file
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@ -0,0 +1,87 @@
From 864113433a67171b3292b9e9dc8ca0f1e4249529 Mon Sep 17 00:00:00 2001
From: thinca <thinca@gmail.com>
Date: Sun, 31 May 2026 12:33:07 +0000
Subject: [PATCH] patch 9.2.0568: pythoncomplete: g:pythoncomplete_allow_import
had no effect
Problem: The security patch 9.2.0561 added a vim.eval() call inside
Completer.evalsource() to honor g:pythoncomplete_allow_import.
But the 'vim' module is only imported inside the outer
vimcomplete() / vimpy3complete() function, not at the script's
top level, so referring to it from a Completer method raises
NameError. The surrounding bare 'except' silently swallows
the error and leaves allow_imports at 0, meaning the opt-in
never takes effect -- 'import os' (and any other
buffer-level import) is always skipped, no candidates are
produced for 'os.<...>' and
Test_popup_and_preview_autocommand() fails on the Windows
CI matrix (Linux skips the test because Python 2 is absent).
Solution: Re-import 'vim' at the top of evalsource() in both
pythoncomplete.vim and python3complete.vim so the eval reads
the global, and set g:pythoncomplete_allow_import = 1 in the
test (it is the opt-in intended for callers that trust the
buffer contents) (thinca).
closes: #20386
Signed-off-by: thinca <thinca@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
---
runtime/autoload/python3complete.vim | 3 +++
runtime/autoload/pythoncomplete.vim | 3 +++
src/testdir/test_popup.vim | 4 ++++
3 files changed, 10 insertions(+)
diff --git a/runtime/autoload/python3complete.vim b/runtime/autoload/python3complete.vim
index 5dcfb73..cd8786d 100644
--- a/runtime/autoload/python3complete.vim
+++ b/runtime/autoload/python3complete.vim
@@ -127,6 +127,9 @@ class Completer(object):
self.parser = PyParser()
def evalsource(self,text,line=0):
+ # vim is imported locally in vimpy3complete(); re-import here so the
+ # vim.eval() below works (otherwise NameError, silently caught).
+ import vim
sc = self.parser.parse(text,line)
try: allow_imports = int(
vim.eval("get(g:, 'pythoncomplete_allow_import', 0)"))
diff --git a/runtime/autoload/pythoncomplete.vim b/runtime/autoload/pythoncomplete.vim
index 6f72b11..a4dc18c 100644
--- a/runtime/autoload/pythoncomplete.vim
+++ b/runtime/autoload/pythoncomplete.vim
@@ -144,6 +144,9 @@ class Completer(object):
self.parser = PyParser()
def evalsource(self,text,line=0):
+ # vim is imported locally in vimcomplete(); re-import here so the
+ # vim.eval() below works (otherwise NameError, silently caught).
+ import vim
sc = self.parser.parse(text,line)
try: allow_imports = int(
vim.eval("get(g:, 'pythoncomplete_allow_import', 0)"))
diff --git a/src/testdir/test_popup.vim b/src/testdir/test_popup.vim
index ed31985..49ea6c6 100644
--- a/src/testdir/test_popup.vim
+++ b/src/testdir/test_popup.vim
@@ -680,6 +680,9 @@ func Test_popup_and_preview_autocommand()
au!
au BufAdd * nested tab sball
augroup END
+ " Let pythoncomplete follow the buffer's 'import os' (off by default
+ " since v9.2.0561) so 'os.' can be completed.
+ let g:pythoncomplete_allow_import = 1
set omnifunc=pythoncomplete#Complete
call setline(1, 'import os')
" make the line long
@@ -702,6 +705,7 @@ func Test_popup_and_preview_autocommand()
augroup END
augroup! MyBufAdd
bw!
+ unlet g:pythoncomplete_allow_import
endfunc
func Test_balloon_split()
--
2.52.0

11
vim.spec
View File

@ -185,6 +185,14 @@ Patch3060: 0001-patch-9.2.0496-security-Code-Injection-in-cucumber-f.patch
# Adapted for vim 8.0: netrw.vim path differs, setline uses (cnt+lastline),
# stripped src/version.c and Last Change comment, created minimal test file
Patch3061: 0001-patch-9.2.0495-security-runtime-netrw-code-injection.patch
# RHEL-186648 CVE-2026-52858 possible code execution with python3complete
# https://redhat.atlassian.net/browse/RHEL-186648
# https://github.com/vim/vim/commit/4b850457e12e1a678dd209f2868154f7553cbf8d
# stripped src/version.c hunk and omitted v0.10 changelog comments
Patch3062: 0001-patch-9.2.0561-security-possible-code-execution-with.patch
# https://github.com/vim/vim/commit/868ad62cb8bf8038322eab2badd31bd98b02b9df
# stripped src/version.c hunk
Patch3063: 0001-patch-9.2.0568-pythoncomplete-g-pythoncomplete_allow.patch
# gcc is no longer in buildroot by default
@ -428,6 +436,8 @@ perl -pi -e "s,bin/nawk,bin/awk,g" runtime/tools/mve.awk
%patch -P 3059 -p1 -b .tar-shellescape-fix
%patch -P 3060 -p1 -b .cucumber-code-injection
%patch -P 3061 -p1 -b .netrw-injection
%patch -P 3062 -p1 -b .CVE-2026-52858
%patch -P 3063 -p1 -b .CVE-2026-52858-fix
%build
@ -949,6 +959,7 @@ touch %{buildroot}/%{_datadir}/%{name}/vimfiles/doc/tags
%changelog
* Wed Jul 01 2026 RHEL Packaging Agent <redhat-ymir-agent@redhat.com> - 2:8.0.1763-27
- RHEL-186656 CVE-2026-47162 vim: netrw code injection via NetrwBookHistSave
- RHEL-186648 CVE-2026-52858 vim: possible code execution with python3complete
* Tue Jun 30 2026 RHEL Packaging Agent <redhat-ymir-agent@redhat.com> - 2:8.0.1763-26
- CVE-2026-47167 vim: Code Injection in cucumber filetype plugin