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TI-2026-40343 Aliases CVE-2026-55892

Vim: Out-of-bounds Write in Spell File Prefix Dump

Priority LOW 24CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 8 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

Vim is an open source, command line text editor. Prior to 9.2.0662, the dump_prefixes() function in src/spell.c walks a spell-file prefix trie iteratively with a depth counter while dumping the prefixes that apply to a word. 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 (prefix[], arridx[], curi[]). A crafted .spl file, loaded when the user dumps the word list, 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 9.2.0662.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0012 1st percentileScored 2026-11-07
Fix Partial vim (vim): 9.2.0662Red Hat: 6 advisoriesRed Hat: 8 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
vimvimbefore 9.2.06629.2.0662Patch availableCNA
  • vim Vendorvim Affected before 9.2.0662 Fixed in 9.2.0662 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:*before 9.2.0662Vulnerablevim
  • cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:* Versions before 9.2.0662 Vulnerable ·vim

Remediation

  • Fix · CNA vim (vim) Fixed in 9.2.0662

Red Hat 6 advisories

  • RHSA-2026:71603 Released 2026-09-24 · Red Hat rating Important
    Red Hat Update Infrastructure 5.3 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-rhel9, registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9 +2
  • RHSA-2026:67956 Released 2026-09-16 · Red Hat rating Important
    Red Hat Update Infrastructure 5.3 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-rhel9, registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9 +2
  • RHSA-2026:66366 Released 2026-09-10 · Red Hat rating Important
    vim security update
    • Red Hat Enterprise Linux AppStream (v. 9) vim-X11-2:8.2.2637-26.el9_8.21, vim-common-2:8.2.2637-26.el9_8.21, vim-enhanced-2:8.2.2637-26.el9_8.21
    • Red Hat Enterprise Linux BaseOS (v. 9) vim-2:8.2.2637-26.el9_8.21
Show 3 more Red Hat advisories
  • RHSA-2026:66348 Released 2026-09-10 · Red Hat rating Important
    vim security update
    • Red Hat Enterprise Linux AppStream (v. 8) vim-X11-2:8.0.1763-31.el8_10.7, vim-common-2:8.0.1763-31.el8_10.7, vim-enhanced-2:8.0.1763-31.el8_10.7
    • Red Hat Enterprise Linux BaseOS (v. 8) vim-2:8.0.1763-31.el8_10.7
  • RHSA-2026:66336 Released 2026-09-10 · Red Hat rating Important
    vim security update
    • Red Hat Enterprise Linux AppStream (v. 10) vim-X11-2:9.1.083-9.el10_2.20, vim-common-2:9.1.083-9.el10_2.20, vim-enhanced-2:9.1.083-9.el10_2.20
    • Red Hat Enterprise Linux BaseOS (v. 10) vim-2:9.1.083-9.el10_2.20
  • RHSA-2026:35387 Released 2026-07-03 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images vim-2:9.2.780-1.hum1@src, vim-X11-2:9.2.780-1.hum1@aarch64, vim-X11-2:9.2.780-1.hum1@x86_64 +14

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:66336
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:66348
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:66366
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:66336
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:66348
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:66366
Red Hat Hardened ImagesFixed RHSA-2026:35387
Red Hat Update Infrastructure 5Fixed RHSA-2026:67956, RHSA-2026:71603
Not affected: 7 products
  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux AppStream (v. 8)
  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux BaseOS (v. 10)
  • Red Hat Enterprise Linux BaseOS (v. 8)
  • Red Hat Enterprise Linux BaseOS (v. 9)
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55892
  2. 2026-11-06 Affected versions changed · Red Hat

References

Patch 1

Advisory 1

Other 1

  • TI-2022-03248 Heap-based Buffer Overflow in vim/vim CVSS 3.1CRITICAL 9.8
  • TI-2024-15103 Vim before 9.0.2142 has a stack-based buffer overflow because did_set_langmap in map.c… CVSS 3.1HIGH 7.8
  • TI-2023-05093 Use After Free in vim/vim CVSS 3.1HIGH 7.8
  • TI-2023-04407 Heap-based Buffer Overflow in vim/vim CVSS 3.1HIGH 7.8
  • TI-2023-04379 Heap-based Buffer Overflow in vim/vim CVSS 3.1HIGH 7.8
  • TI-2023-04378 Use After Free in vim/vim CVSS 3.1HIGH 7.8
See all 258 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences