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Vim CVE-2026-59856

HIGH
Code Injection (CWE-94)
2026-07-09 GitHub_M
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 because malicious content must be loaded and completion manually invoked (AV:L, UI:R); no auth needed (PR:N); injected shell commands yield full C/I/A impact.

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

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

1
Analysis Generated
Jul 09, 2026 - 23:22 vuln.today

DescriptionCVE.org

Vim is an open source, command line text editor. Prior to 9.2.0736, the PHP omni-completion script in runtime/autoload/phpcomplete.vim interpolates a class or trait name, taken from the contents of the edited buffer, into a search() pattern that is run via win_execute() without escaping. A name containing a single quote can terminate the search() string argument early, and because the bar is honored as an Ex command separator, the remainder of the name is run as Ex commands; via the :! command this allows arbitrary operating-system command execution when a victim opens a crafted PHP file and invokes omni-completion. This issue is fixed in version 9.2.0736.

AnalysisAI

Arbitrary OS command execution in Vim prior to 9.2.0736 arises from the bundled PHP omni-completion script (runtime/autoload/phpcomplete.vim), which interpolates an attacker-controlled class or trait name from the edited buffer into a search() pattern executed via win_execute() without escaping. When a victim opens a crafted PHP file and invokes omni-completion, a name containing a single quote breaks out of the search string and the trailing text is honored as Ex commands, letting an attacker run shell commands through :! …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Deliver crafted PHP file to victim
Delivery
Victim opens file in vulnerable Vim
Exploit
Victim invokes PHP omni-completion
Execution
Malicious name escapes search() pattern
Persist
Injected Ex :! command runs
Impact
Arbitrary OS commands execute as victim

Vulnerability AssessmentAI

Exploitation Exploitation requires that the victim (1) is running Vim before 9.2.0736 with the bundled PHP omni-completion script phpcomplete.vim present, (2) opens an attacker-controlled PHP file whose class or trait name contains a single quote plus injected Ex text (e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-supplied CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H, score 8.4) reflects local attack surface with high confidentiality, integrity, and availability impact but mandatory active user interaction - the victim must both open the malicious PHP file and manually trigger omni-completion. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a PHP file in which a class or trait name embeds a single quote followed by a bar and an Ex command such as :!, then delivers it to a developer via a repository, email attachment, or shared project. The developer opens the file in a pre-9.2.0736 Vim and triggers PHP omni-completion, at which point the malicious name breaks out of the search() pattern and the injected :! …
Remediation Apply the vendor-released patch: upgrade Vim to version 9.2.0736 or later, which fixes the unescaped interpolation in phpcomplete.vim (fix commit 43afc581a37a35762dd0ef292f038b9dc5680a24; advisory https://github.com/vim/vim/security/advisories/GHSA-fh26-8f79-wj97). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: inventory systems running Vim versions prior to 9.2.0736 via endpoint management tools. …

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CVE-2026-59856 vulnerability details – vuln.today

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