CVE-2026-59856 vim CVE debrief

Who should care

Users of Vim, especially those working with PHP files, should be aware of this vulnerability and update to Vim version 9.2.0736 or later to mitigate the risk. This vulnerability may affect developers, system administrators, and security teams who use Vim for editing PHP files.

Technical summary

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.

Defensive priority

High

Recommended defensive actions

• Update to Vim version 9.2.0736 or later
• Use caution when opening PHP files from untrusted sources
• Consider disabling omni-completion for PHP files until a fix is applied
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-09T23:17:06.420Z and last modified on 2026-07-10T16:16:38.283Z. The NVD entry is currently Undergoing Analysis. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. 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. This allows arbitrary operating-system command execution when a victim opens a crafted PHP file and invokes omni-completion.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.