CVE-2026-59858
Vim C omni-completion allows execution of arbitrary Ex commands via crafted tags.
Is CVE-2026-59858 being exploited?
Not confirmed. CVE-2026-59858 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.14% probability of exploitation in the next 30 days.
How severe is CVE-2026-59858?
CVE-2026-59858 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-59858?
Yes. A fix has been recorded for CVE-2026-59858. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-59858 affect?
CVE-2026-59858 affects Vim < 9.2.0735, runtime/autoload/ccomplete.vim (C omni-completion). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-59858?
Upgrade Vim to >=9.2.0735 and avoid opening untrusted tags/project files.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary Ex command execution as the editing user by processing a malicious tags entry (remote via tricking user to open project files).
Immediate action required
- affected< 9.2.0735
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.