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Fencer Vulns
high 7.8

CVE-2026-55693 json

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

published 2026-06-25 4 mo ago modified 2026-06-26 4 mo ago also EUVD-2026-39452

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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.

Patch / fix

  • vim vim 9.2.0653
  • vim Debian 13 2:9.1.1230-2+deb13u1
  • vim Debian 14 2:9.2.0782-1

debian advisories DEBIAN-CVE-2026-55693

  • vim Ubuntu 22.04 LTS 2:8.2.3995-1ubuntu2.33
  • vim Ubuntu 24.04 LTS 2:9.1.0016-1ubuntu7.17
  • vim Ubuntu 25.10 2:9.1.0967-1ubuntu6.8
  • vim Ubuntu 26.04 LTS 2:9.1.2141-1ubuntu4.6
  • vim Ubuntu Pro 14.04 LTS 2:7.4.052-1ubuntu3.1+esm30
  • vim Ubuntu Pro 16.04 LTS 2:7.4.1689-3ubuntu1.5+esm36
  • vim Ubuntu Pro 18.04 LTS 2:8.0.1453-1ubuntu1.13+esm21
  • vim Ubuntu Pro 20.04 LTS 2:8.1.2269-1ubuntu5.32+esm9

ubuntu advisories UBUNTU-CVE-2026-55693

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • vim RHEL 10.2 2:9.1.083-9.el10_2.12
  • vim-X11 RHEL 10.2 2:9.1.083-9.el10_2.12
  • vim-common RHEL 10.2 2:9.1.083-9.el10_2.12
  • vim-enhanced RHEL 10.2 2:9.1.083-9.el10_2.12
  • vim RHEL 8 2:8.0.1763-31.el8_10
  • vim-X11 RHEL 8 2:8.0.1763-31.el8_10
  • vim-common RHEL 8 2:8.0.1763-31.el8_10
  • vim-enhanced RHEL 8 2:8.0.1763-31.el8_10

red hat advisories RHSA-2026:72465RHSA-2026:72466RHSA-2026:70818RHSA-2026:69128RHSA-2026:68711RHSA-2026:55431

  • xxd AlmaLinux 10 2:9.1.083-9.el10_2.12
  • vim-X11 AlmaLinux 10 2:9.1.083-9.el10_2.12
  • vim-data AlmaLinux 10 2:9.1.083-9.el10_2.12
  • vim-common AlmaLinux 10 2:9.1.083-9.el10_2.12
  • vim-minimal AlmaLinux 10 2:9.1.083-9.el10_2.12
  • vim-enhanced AlmaLinux 10 2:9.1.083-9.el10_2.12
  • vim-filesystem AlmaLinux 10 2:9.1.083-9.el10_2.12
  • vim-X11 AlmaLinux 8 2:8.0.1763-31.el8_10

almalinux advisories ALSA-2026:48650ALSA-2026:48703ALSA-2026:47982

  • vim Rocky Linux 10 2:9.1.083-9.el10_2.12
  • vim Rocky Linux 8 2:8.0.1763-31.el8_10
  • vim Rocky Linux 9 2:8.2.2637-26.el9_8.13

rocky linux advisories RLSA-2026:48650RLSA-2026:48703RLSA-2026:47982

  • vim Azure Linux 3.0 9.2.0735-1

azure linux advisories AZL-91107

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-55693 updated cvss 7.3

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

  • Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available
  • Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1790621718, rhaiis/vllm-rocm-rhel9 1790621713, rhaiis/model-opt-cuda-rhel9 1790621714
    fixed: vendor fix RHSA-2026:73859
  • Red Hat AI Inference Server 3.5 rhaii/vllm-cpu-rhel9 1791473614, rhaii/vllm-cuda-rhel9 1791473631, rhaii/vllm-rocm-rhel9 1791425869, rhaii/vllm-gaudi-rhel9 1791427182, rhaii/vllm-spyre-rhel9 1791818357, rhaii/model-opt-cuda-rhel9 1791803821
    fixed: vendor fix RHSA-2026:82066
  • Red Hat Enterprise Linux AI 3.5 rhelai3/bootc-cuda-rhel9 1793135861, rhelai3/bootc-rocm-rhel9 1793135863, rhelai3/bootc-aws-cuda-rhel9 1793194817, rhelai3/bootc-gcp-cuda-rhel9 1793194815, rhelai3/disk-image-cuda-rhel9 1793206758, rhelai3/bootc-azure-cuda-rhel9 1793194815, +1 more
    fixed: vendor fix RHSA-2026:92452
  • Red Hat Enterprise Linux AppStream (v. 8) vim-X11 8.0.1763-31.el8_10, vim-enhanced 8.0.1763-31.el8_10
    fixed: vendor fix RHSA-2026:48703
  • Red Hat Enterprise Linux AppStream (v. 9) vim-X11 8.2.2637-26.el9_8.13, vim-enhanced 8.2.2637-26.el9_8.13
    fixed: vendor fix RHSA-2026:47982
  • Red Hat Enterprise Linux AppStream (v. 10) vim-X11 9.1.083-9.el10_2.12, vim-enhanced 9.1.083-9.el10_2.12
    fixed: vendor fix RHSA-2026:48650
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) vim-X11 8.2.2637-20.el9_2.3, vim-common 8.2.2637-20.el9_2.3, vim-enhanced 8.2.2637-20.el9_2.3
    fixed: vendor fix RHSA-2026:72466
show 22 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) vim-X11 8.2.2637-20.el9_4.4, vim-common 8.2.2637-20.el9_4.4, vim-enhanced 8.2.2637-20.el9_4.4
    fixed: vendor fix RHSA-2026:72465
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) vim-X11 9.1.083-5.el10_0.4, vim-enhanced 9.1.083-5.el10_0.4
    fixed: vendor fix RHSA-2026:55431
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) vim-X11 8.2.2637-22.el9_6.4, vim-common 8.2.2637-22.el9_6.4, vim-enhanced 8.2.2637-22.el9_6.4
    fixed: vendor fix RHSA-2026:70818
  • Red Hat Enterprise Linux BaseOS (v. 8) vim 8.0.1763-31.el8_10
    fixed: vendor fix RHSA-2026:48703
  • Red Hat Enterprise Linux BaseOS (v. 9) vim 8.2.2637-26.el9_8.13
    fixed: vendor fix RHSA-2026:47982
  • Red Hat Enterprise Linux BaseOS (v. 10) vim 9.1.083-9.el10_2.12
    fixed: vendor fix RHSA-2026:48650
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) vim 8.2.2637-20.el9_2.3, vim-minimal 8.2.2637-20.el9_2.3, vim-filesystem 8.2.2637-20.el9_2.3
    fixed: vendor fix RHSA-2026:72466
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) vim 8.2.2637-20.el9_4.4, vim-minimal 8.2.2637-20.el9_4.4, vim-filesystem 8.2.2637-20.el9_4.4
    fixed: vendor fix RHSA-2026:72465
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) vim 9.1.083-5.el10_0.4
    fixed: vendor fix RHSA-2026:55431
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) vim 8.2.2637-22.el9_6.4, vim-minimal 8.2.2637-22.el9_6.4, vim-filesystem 8.2.2637-22.el9_6.4
    fixed: vendor fix RHSA-2026:70818
  • Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) vim 7.4.629-5.el6_10.4, vim-X11 7.4.629-5.el6_10.4, vim-enhanced 7.4.629-5.el6_10.4
    fixed: vendor fix RHSA-2026:69128
  • Red Hat Enterprise Linux Server (v. 7 ELS) vim 7.4.629-8.el7_9.2, vim-X11 7.4.629-8.el7_9.2, vim-common 7.4.629-8.el7_9.2, vim-minimal 7.4.629-8.el7_9.2, vim-enhanced 7.4.629-8.el7_9.2
    fixed: vendor fix RHSA-2026:68711
  • Red Hat Hardened Images vim 9.2.725-1.hum1, xxd 9.2.725-1.hum1, vim-X11 9.2.725-1.hum1, vim-data 9.2.725-1.hum1, vim-common 9.2.725-1.hum1, vim-minimal 9.2.725-1.hum1, +3 more
    fixed: vendor fix RHSA-2026:30267
  • Red Hat Insights proxy 1.5 insights-proxy/insights-proxy-container-rhel9 1786433656
    fixed: vendor fix RHSA-2026:53371
  • Red Hat OpenShift AI 3.0 rhai/base-image-cpu-rhel9 1790277045, rhai/base-image-tpu-rhel9 1790276884, rhai/base-image-cuda-rhel9 1790276974, rhai/base-image-rocm-rhel9 1790276886, rhai/base-image-spyre-rhel9 1790276889
    fixed: vendor fix RHSA-2026:73960
  • Red Hat OpenShift AI 3.2 rhai/base-image-cpu-rhel9 1790703590, rhai/base-image-tpu-rhel9 1790703497, rhai/base-image-cuda-rhel9 1790703586, rhai/base-image-rocm-rhel9 1790703494, rhai/base-image-rocm-rhel9 1790703506, rhai/base-image-spyre-rhel9 1790703568
    fixed: vendor fix RHSA-2026:74460
  • Red Hat OpenShift AI 3.3 rhai/base-image-cpu-rhel9 1790703615, rhai/base-image-tpu-rhel9 1790703516, rhai/base-image-spyre-rhel9 1790703579, rhai/base-image-neuron-rhel9 1790703516, rhai/base-image-rocm-6.4-rhel9 1790703524, rhai/base-image-rocm-7.0-rhel9 1790703516, +4 more
    fixed: vendor fix RHSA-2026:74359
  • Red Hat OpenShift AI 3.4 rhai/base-image-cpu-rhel9 1790703631, rhai/base-image-tpu-rhel9 1790703539, rhai/base-image-gaudi-rhel9 1790703553, rhai/base-image-spyre-rhel9 1790703597, rhai/base-image-neuron-rhel9 1790703542, rhai/base-image-rocm-6.4-rhel9 1790703545, +3 more
    fixed: vendor fix RHSA-2026:74679
  • Red Hat OpenShift AI 3.5 rhai/base-image-cpu-rhel9 1790703656, rhai/base-image-tpu-rhel9 1790703554, rhai/base-image-gaudi-rhel9 1790703552, rhai/base-image-rubin-rhel9 1790703707, rhai/base-image-spyre-rhel9 1790703630, rhai/base-image-neuron-rhel9 1790703557, +3 more
    fixed: vendor fix RHSA-2026:75652
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202608130832
    fixed: vendor fix RHSA-2026:54769
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1786533457, rhui5/rhua-rhel9 1786533529, rhui5/haproxy-rhel9 1786533449, rhui5/rhua-tp-rhel9 1787241260, rhui5/installer-rhel9 1786435483, rhui5/installer-tp-rhel9 1787135742, +2 more
    fixed: vendor fix RHSA-2026:54387
  • Red Hat Enterprise Linux AppStream (v. 8) vim-common 8.0.1763-31.el8_10, vim-filesystem 8.0.1763-31.el8_10 Red Hat Enterprise Linux AppStream (v. 9) vim-common 8.2.2637-26.el9_8.13 Red Hat Enterprise Linux AppStream (v. 10) xxd 9.1.083-9.el10_2.12, vim-common 9.1.083-9.el10_2.12 Red Hat Enterprise Linux AppStream EUS (v. 10.0) xxd 9.1.083-5.el10_0.4, vim-common 9.1.083-5.el10_0.4 Red Hat Enterprise Linux BaseOS (v. 8) vim-minimal 8.0.1763-31.el8_10 Red Hat Enterprise Linux BaseOS (v. 9) vim-minimal 8.2.2637-26.el9_8.13, vim-filesystem 8.2.2637-26.el9_8.13
    +5 more products
    Red Hat Enterprise Linux BaseOS (v. 10) vim-data 9.1.083-9.el10_2.12, vim-minimal 9.1.083-9.el10_2.12, vim-filesystem 9.1.083-9.el10_2.12 Red Hat Enterprise Linux BaseOS EUS (v. 10.0) vim-data 9.1.083-5.el10_0.4, vim-minimal 9.1.083-5.el10_0.4, vim-filesystem 9.1.083-5.el10_0.4 Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) vim-common 7.4.629-5.el6_10.4, vim-minimal 7.4.629-5.el6_10.4, vim-filesystem 7.4.629-5.el6_10.4 Red Hat Enterprise Linux Server (v. 7 ELS) vim-filesystem 7.4.629-8.el7_9.2 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    not affected: vulnerable code not present

1 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.7 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
CNA 4.0 5.7 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 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • vim vim

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.