CVE-2026-55892Public exploit

Editor crash via unchecked prefix-trie depth

Published Jun 25, 2026 · Updated Jun 25, 2026

Stack out-of-bounds write in Vim before 9.2.0662 allows local users to crash the editor through a crafted spell file and word-list dump. The dump_prefixes() walker follows self-referential BY_INDEX nodes without bounding depth before indexing fixed MAXWLEN stack arrays. Reaching the flaw requires spell checking and a user-initiated word-list dump; the documented consequence is call-frame corruption and process termination.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack out-of-bounds write in Vim before 9.2.0662 allows local users to crash the editor through a crafted spell file and word-list dump. The dump_prefixes() walker follows self-referential BY_INDEX nodes without bounding depth before indexing fixed MAXWLEN stack arrays. Reaching the flaw requires spell checking and a user-initiated word-list dump; the documented consequence is call-frame corruption and process termination.

The record

CVE
CVE-2026-55892
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Vim
Product
Vim
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 9.2.0662

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Vim · Vimversion=< 9.2.0662

Published CVSS scores

5.5GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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