Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-55693Vim: Out-of-bounds Write in Spell File Word Count
Medium 5.7
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 9.2.0653, 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | vim-X11 | 2:9.1.083-9.el10_2.12 | ALSA-2026:48650 |
| AlmaLinux:8 | vim-X11 | 2:8.0.1763-31.el8_10 | ALSA-2026:48703 |
| AlmaLinux:9 | vim-X11 | 2:8.2.2637-26.el9_8.13 | ALSA-2026:47982 |
| AlmaLinux:10 | vim-common | 2:9.1.083-9.el10_2.12 | ALSA-2026:48650 |
| AlmaLinux:8 | vim-common | 2:8.0.1763-31.el8_10 | ALSA-2026:48703 |
| AlmaLinux:9 | vim-common | 2:8.2.2637-26.el9_8.13 | ALSA-2026:47982 |
| AlmaLinux:10 | vim-data | 2:9.1.083-9.el10_2.12 | ALSA-2026:48650 |
| AlmaLinux:10 | vim-enhanced | 2:9.1.083-9.el10_2.12 | ALSA-2026:48650 |
| AlmaLinux:8 | vim-enhanced | 2:8.0.1763-31.el8_10 | ALSA-2026:48703 |
| AlmaLinux:9 | vim-enhanced | 2:8.2.2637-26.el9_8.13 | ALSA-2026:47982 |
| AlmaLinux:10 | vim-filesystem | 2:9.1.083-9.el10_2.12 | ALSA-2026:48650 |
| AlmaLinux:8 | vim-filesystem | 2:8.0.1763-31.el8_10 | ALSA-2026:48703 |
| AlmaLinux:9 | vim-filesystem | 2:8.2.2637-26.el9_8.13 | ALSA-2026:47982 |
| AlmaLinux:10 | vim-minimal | 2:9.1.083-9.el10_2.12 | ALSA-2026:48650 |
| AlmaLinux:8 | vim-minimal | 2:8.0.1763-31.el8_10 | ALSA-2026:48703 |
| AlmaLinux:9 | vim-minimal | 2:8.2.2637-26.el9_8.13 | ALSA-2026:47982 |
| AlmaLinux:10 | xxd | 2:9.1.083-9.el10_2.12 | ALSA-2026:48650 |
| Debian:12 | vim | no fix listed | DEBIAN-CVE-2026-55693 |
| Debian:13 | vim | 2:9.1.1230-2+deb13u1 | DEBIAN-CVE-2026-55693 |
| Debian:14 | vim | 2:9.2.0782-1 | DEBIAN-CVE-2026-55693 |
| Rocky Linux:10 | vim | 2:9.1.083-9.el10_2.12 | RLSA-2026:48650 |
| Rocky Linux:8 | vim | 2:8.0.1763-31.el8_10 | RLSA-2026:48703 |
| Rocky Linux:9 | vim | 2:8.2.2637-26.el9_8.13 | RLSA-2026:47982 |
| Ubuntu:22.04:LTS | vim | 2:8.2.3995-1ubuntu2.33 | UBUNTU-CVE-2026-55693 |
| Ubuntu:22.04:LTS | vim | 2:8.2.3995-1ubuntu2.33 | USN-8500-1 |
| 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-2026-55693 |
| Ubuntu:25.10 | vim | 2:9.1.0967-1ubuntu6.8 | USN-8500-1 |
| Ubuntu:25.10 | vim | 2:9.1.0967-1ubuntu6.8 | UBUNTU-CVE-2026-55693 |
| 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-2026-55693 |
Affected products (as reported)
Weakness: CWE-787 · 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
References
- https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq x_refsource_CONFIRM
- https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7 x_refsource_MISC
- https://github.com/vim/vim/releases/tag/v9.2.0653 x_refsource_MISC