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CVE-2026-55693· NVD / CVE Program· CNA GitHub_M

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

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: vim vim 9.2.0653; azl3 vim 9.2.0620-1 on Azure Linux 3.0 9.2.0735-1.

Low priority for now. Upgrade to vim vim 9.2.0653; azl3 vim 9.2.0620-1 on Azure Linux 3.0 9.2.0735-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Vim is an open source, command line text editor. Prior to 9.2.0653, the tree_count_words() function in src/spellfile.c fills in the word-count fields of a spell-file word trie by walking it iteratively with a depth counter. The counter is bounded only by the trie structure itself; it is never checked against the size of the fixed MAXWLEN-element stack arrays it indexes (arridx[], curi[], wordcount[]). A crafted .spl/.sug file pair, loaded when the user invokes spell suggestion, can drive the descent arbitrarily deep, so the function writes past the end of those arrays. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0653.

MediumCVSS 5.7 · v4.0—No exploit Fix available
Published
Jun 25, 2026
Updated
Jun 26, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
5.7
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
vimvim

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • vim vimbefore 9.2.0653

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • vim vim

    • < 9.2.0653affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10vim-commonbefore 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12
AlmaLinux:10vim-databefore 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12
AlmaLinux:10vim-enhancedbefore 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12
AlmaLinux:10vim-filesystembefore 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12
AlmaLinux:10vim-minimalbefore 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12
AlmaLinux:10vim-X11before 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12
AlmaLinux:10xxdbefore 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12
AlmaLinux:8vim-commonbefore 2:8.0.1763-31.el8_102:8.0.1763-31.el8_10
AlmaLinux:8vim-enhancedbefore 2:8.0.1763-31.el8_102:8.0.1763-31.el8_10
AlmaLinux:8vim-filesystembefore 2:8.0.1763-31.el8_102:8.0.1763-31.el8_10
AlmaLinux:8vim-minimalbefore 2:8.0.1763-31.el8_102:8.0.1763-31.el8_10
AlmaLinux:8vim-X11before 2:8.0.1763-31.el8_102:8.0.1763-31.el8_10
AlmaLinux:9vim-commonbefore 2:8.2.2637-26.el9_8.132:8.2.2637-26.el9_8.13
AlmaLinux:9vim-enhancedbefore 2:8.2.2637-26.el9_8.132:8.2.2637-26.el9_8.13
AlmaLinux:9vim-filesystembefore 2:8.2.2637-26.el9_8.132:8.2.2637-26.el9_8.13
AlmaLinux:9vim-minimalbefore 2:8.2.2637-26.el9_8.132:8.2.2637-26.el9_8.13
AlmaLinux:9vim-X11before 2:8.2.2637-26.el9_8.132:8.2.2637-26.el9_8.13
Debian:12vimall versions—
Debian:14vimbefore 2:9.2.0782-12:9.2.0782-1
Red Hat:enterprise_linux_eus:10.0vimbefore 2:9.1.083-5.el10_0.42:9.1.083-5.el10_0.4
Red Hat:enterprise_linux_eus:10.0vim-commonbefore 2:9.1.083-5.el10_0.42:9.1.083-5.el10_0.4
Red Hat:enterprise_linux_eus:10.0vim-enhancedbefore 2:9.1.083-5.el10_0.42:9.1.083-5.el10_0.4
Red Hat:enterprise_linux_eus:10.0vim-X11before 2:9.1.083-5.el10_0.42:9.1.083-5.el10_0.4
Red Hat:enterprise_linux:10.2vimbefore 2:9.1.083-9.el10_2.122:9.1.083-9.el10_2.12

+69

Same product

vim: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-2712Vim 7.1.314, 6.4, and other versions allows user-assisted remote attackers to execute arbitrary commands via Vim scripts that do not properl
    42Plan
  • CVE-2022-0318Heap-based Buffer Overflow in vim/vim
    40Plan
  • CVE-2019-12735getchar.c in Vim before 8.1.1365 and Neovim before 0.3.6 allows remote attackers to execute arbitrary OS commands via the :source! command i
    40Plan
  • CVE-2017-6350An integer overflow at an unserialize_uep memory allocation site would occur for vim before patch 8.0.0378, if it does not properly validate
    40Plan
  • CVE-2017-6349An integer overflow at a u_read_undo memory allocation site would occur for vim before patch 8.0.0377, if it does not properly validate valu
    40Plan
  • CVE-2017-5953vim before patch 8.0.0322 does not properly validate values for tree length when handling a spell file, which may result in an integer overf
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
vim vim9.2.0653 · descriptionVendor (CNA)
azl3 vim 9.2.0620-1 on Azure Linux 3.09.2.0735-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:vim-common2:8.2.2637-26.el9_8.13 · AlmaLinux:9Package registry (OSV)
almalinux:vim-data2:9.1.083-9.el10_2.12 · AlmaLinux:10Package registry (OSV)
almalinux:vim-enhanced2:8.2.2637-26.el9_8.13 · AlmaLinux:9Package registry (OSV)
almalinux:vim-filesystem2:8.2.2637-26.el9_8.13 · AlmaLinux:9Package registry (OSV)
almalinux:vim-minimal2:8.2.2637-26.el9_8.13 · AlmaLinux:9Package registry (OSV)
almalinux:vim-X112:8.2.2637-26.el9_8.13 · AlmaLinux:9Package registry (OSV)
almalinux:xxd2:9.1.083-9.el10_2.12 · AlmaLinux:10Package registry (OSV)
debian:vim2:9.2.0782-1 · Debian:14Package registry (OSV)
red hat:vim0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-common0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-common2:8.2.2637-26.el9_8.13 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:vim-common-debuginfo2:8.2.2637-22.el9_6.4 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:vim-data0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-debuginfo2:8.2.2637-22.el9_6.4 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:vim-debugsource2:8.2.2637-22.el9_6.4 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:vim-default-editor0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-enhanced0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-enhanced2:8.2.2637-26.el9_8.13 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:vim-enhanced-debuginfo2:8.2.2637-22.el9_6.4 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:vim-filesystem0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-minimal0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-minimal2:7.4.629-8.el7_9.2 · Red Hat:rhel_els:7Package registry (OSV)
red hat:vim-minimal-debuginfo2:8.2.2637-22.el9_6.4 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:vim-X110:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:vim-X11-debuginfo2:8.2.2637-22.el9_6.4 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:xxd0:9.2.725-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
rocky linux:vim2:8.2.2637-26.el9_8.13 · Rocky Linux:9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-558920 days apartVim: Out-of-bounds Write in Spell File Prefix Dump
    22Monitor
  • CVE-2026-5985714 days apartVim: Out-of-bounds Write in SAL Soundfolding
    22Monitor
  • CVE-2025-24014521 days apartsegmentation fault in win_line() in Vim < 9.1.1043
    22Monitor
  • CVE-2026-574550 days apartVim: Stack out-of-bounds write in `spell_soundfold_sofo()` via an over-length `soundfold()` argument
    16Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
A
Scope
X

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records