Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-55892Vim: Out-of-bounds Write in Spell File Prefix Dump
Medium 5.5
In plain English
A medium-severity out-of-bounds write in vim from vim. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | vim-X11 | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-X11 | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-X11 | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-common | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-common | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-common | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-data | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:10 | vim-enhanced | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-enhanced | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-enhanced | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-filesystem | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-filesystem | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-filesystem | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-minimal | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-minimal | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-minimal | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | xxd | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| Alpine:v3.23 | vim | 9.2.0854-r0 | ALPINE-CVE-2026-55892 |
| Alpine:v3.24 | vim | 9.2.0663-r0 | ALPINE-CVE-2026-55892 |
| Debian:12 | vim | no fix listed | DEBIAN-CVE-2026-55892 |
| Debian:13 | vim | 2:9.1.1230-2+deb13u1 | DEBIAN-CVE-2026-55892 |
| Debian:14 | vim | 2:9.2.0782-1 | DEBIAN-CVE-2026-55892 |
| Rocky Linux:10 | vim | 2:9.1.083-9.el10_2.20 | RLSA-2026:66336 |
| Rocky Linux:8 | vim | 2:8.0.1763-31.el8_10.7 | RLSA-2026:66348 |
| Rocky Linux:9 | vim | 2:8.2.2637-26.el9_8.21 | RLSA-2026:66366 |
| Ubuntu:22.04:LTS | vim | 2:8.2.3995-1ubuntu2.33 | USN-8500-1 |
| Ubuntu:22.04:LTS | vim | 2:8.2.3995-1ubuntu2.33 | UBUNTU-CVE-2026-55892 |
| Ubuntu:24.04:LTS | vim | 2:9.1.0016-1ubuntu7.17 | USN-8500-1 |
| Ubuntu:24.04:LTS | vim | 2:9.1.0016-1ubuntu7.17 | UBUNTU-CVE-2026-55892 |
| Ubuntu:25.10 | vim | 2:9.1.0967-1ubuntu6.8 | UBUNTU-CVE-2026-55892 |
| Ubuntu:25.10 | vim | 2:9.1.0967-1ubuntu6.8 | USN-8500-1 |
| Ubuntu:26.04:LTS | vim | 2:9.1.2141-1ubuntu4.6 | USN-8500-1 |
| Ubuntu:26.04:LTS | vim | 2:9.1.2141-1ubuntu4.6 | UBUNTU-CVE-2026-55892 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879h x_refsource_CONFIRM
- https://github.com/vim/vim/commit/8325b193bba5f01e7a7d8241f x_refsource_MISC
- https://github.com/vim/vim/releases/tag/v9.2.0662 x_refsource_MISC