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Vim EUVDEUVD-2026-39436

| CVE-2026-57456 HIGH
Code Injection (CWE-94)
2026-06-25 GitHub_M
Code Injection Python RCE Vim Suse Red Hat
8.4
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.4 HIGH
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.8 HIGH

Local vector because the victim must open the file and invoke completion (UI:R); no target auth needed (PR:N), and exec() of injected Python yields full C/I/A impact at user scope.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Red Hat
7.8 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

3
Patch available
Jun 25, 2026 - 17:02 EUVD
Source Code Evidence Fetched
Jun 25, 2026 - 16:21 vuln.today
Analysis Generated
Jun 25, 2026 - 16:21 vuln.today

DescriptionCVE.org

Vim is an open source, command line text editor. Prior to 9.2.0699, Vim's Python omni-completion (runtime/autoload/python3complete.vim and the legacy pythoncomplete.vim) executes reconstructed function and class definitions from the current buffer with exec() as part of populating the completion dictionary. When reconstructing that source, each scope's docstring is inserted verbatim between triple quotes with no escaping, so a hostile buffer can break out of the triple-quoted literal and execute attacker-controlled Python during omni-completion. This vulnerability is fixed in 9.2.0699.

Articles & Coverage 1

News 4 New Python Vulnerabilities - 1 Critical, 3 High Severity Jun 26, 2026

AnalysisAI

Arbitrary Python code execution in Vim before 9.2.0699 occurs when a victim triggers Python omni-completion (omnifunc) inside a malicious buffer; the python3complete.vim and legacy pythoncomplete.vim runtime plugins reconstruct in-buffer function and class definitions and run them through Python's exec(), inserting each scope's docstring verbatim between triple quotes. Because the docstring is never escaped, a crafted docstring can close the triple-quoted literal and inject attacker-controlled Python that runs with the user's privileges. There is no public exploit identified at time of analysis and the issue is not in CISA KEV, but a regression test bundled with the fix demonstrates the breakout, confirming exploitability; EPSS data was not provided.

Technical ContextAI

The flaw lives in Vim's Python omni-completion runtime scripts (runtime/autoload/python3complete.vim and runtime/autoload/pythoncomplete.vim). To build a completion dictionary, these plugins parse the current buffer and reconstruct source for each function/class scope, then evaluate it with Python's exec(). The vulnerable code path concatenated a scope's docstring directly into a triple-quoted Python string literal ('"""'+self.docstr+'"""'). This is a textbook CWE-94 (Improper Control of Generation of Code, i.e., code injection): untrusted text from the buffer becomes executable code because string boundaries are not sanitized. The fix replaces the naive concatenation with repr(self.docstr), which produces a safely-quoted Python string literal that cannot break out of its delimiters. The affected component is platform-independent but only active when a Python-enabled Vim build uses the Python omni-completion feature.

RemediationAI

Upgrade to Vim 9.2.0699 or later, which is the vendor-released patch (fixing commit cce141c42740f122dd8486ae04e21c2a81016ba8); see GHSA-ppj8-wqjf-6fp3 (https://github.com/vim/vim/security/advisories/GHSA-ppj8-wqjf-6fp3) and the release at https://github.com/vim/vim/releases/tag/v9.2.0699. If you cannot patch immediately, the targeted compensating control is to avoid invoking Python omni-completion on untrusted buffers: do not set omnifunc to python3complete#Complete / pythoncomplete#Complete (and avoid triggering it via Ctrl-X Ctrl-O) when editing files from untrusted sources, or remove/empty the runtime/autoload/python3complete.vim and pythoncomplete.vim scripts so the completion path cannot run - the trade-off is loss of Python autocompletion. As a broader mitigation, treat untrusted source files as hostile and edit them in a sandboxed or unprivileged context, since the injected code runs with the editing user's privileges; note this does not prevent execution, only contains its blast radius.

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Same weakness CWE-94 – Code Injection

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
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SLES15-SP6-CHOST-BYOS-Azure Affected
SLES15-SP6-CHOST-BYOS-EC2 Affected

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EUVD-2026-39436 vulnerability details – vuln.today
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