CVE-2022-2126Public exploit

Editor crash via spell-suggestion index underflow

Published Jun 19, 2022 · Updated Aug 3, 2024

Out-of-bounds read in Vim before 8.2.5123 allows context-dependent attackers to crash the editor through crafted text and spell suggestions. In src/spellsuggest.c, suggest_trie_walk() decrements ts_fidx when it is already zero while handling an inserted trail byte, causing a subsequent lookup to use a negative index. Exploitation requires a user to process attacker-controlled text with spell checking and invoke the suggestion operation; the demonstrated consequence is a process crash.

CVSS severity7.8
High
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Vim before 8.2.5123 allows context-dependent attackers to crash the editor through crafted text and spell suggestions. In src/spellsuggest.c, suggest_trie_walk() decrements ts_fidx when it is already zero while handling an inserted trail byte, causing a subsequent lookup to use a negative index. Exploitation requires a user to process attacker-controlled text with spell checking and invoke the suggestion operation; the demonstrated consequence is a process crash.

The record

CVE
CVE-2022-2126
Published
Jun 19, 2022
Updated
Aug 3, 2024
Vendor
Vim
Product
Vim
Classifications
CWE-125, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=unspecified <8.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Vim · Vimversion=unspecified <8.2

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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