CVE-2026-55693: Vim: Out-of-bounds Write in Spell File Word Count

highCVSS 7.8CVE-2026-55693

CSIRTS triage

vendor: Vim product: Vim Memory corruption

What: An out-of-bounds write can occur in the spell file word count functionality of Vim.
Who is affected: Deployments using Vim with spell file features enabled.
Urgency: Remediation is urgent due to the high severity rating, indicating potential security risks.
Action: Update to the latest version of Vim that addresses this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55693

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-556930.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55693	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] vim: Vulnerability allows denial of servicecert-bund

Recent advisories for Vim

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[UPDATE] [medium] vim: Multiple vulnerabilities allow code executioncert-bund · 2026-07-10
medium[UPDATE] [medium] vim: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
highCVE-2026-59858: Vim is an open source, command line text editor. Prior to 9.2.0735, the C omni-completion scri…nvd · 2026-07-09
mediumCVE-2026-59857: Vim is an open source, command line text editor. Prior to 9.2.0725, the single-byte branch of …nvd · 2026-07-09
highCVE-2026-59856: Vim is an open source, command line text editor. Prior to 9.2.0736, the PHP omni-completion sc…nvd · 2026-07-09
high[UPDATE] [high] vim: Vulnerability allows code executioncert-bund · 2026-07-07