CVE-2026-55693
Publication date 25 June 2026
Last updated 2 July 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| vim | 26.04 LTS resolute |
Fixed 2:9.1.2141-1ubuntu4.6
|
| 25.10 questing |
Fixed 2:9.1.0967-1ubuntu6.8
|
|
| 24.04 LTS noble |
Fixed 2:9.1.0016-1ubuntu7.17
|
|
| 22.04 LTS jammy |
Fixed 2:8.2.3995-1ubuntu2.33
|
|
| 20.04 LTS focal |
Fixed 2:8.1.2269-1ubuntu5.32+esm9
|
|
| 18.04 LTS bionic |
Fixed 2:8.0.1453-1ubuntu1.13+esm21
|
|
| 16.04 LTS xenial |
Fixed 2:7.4.1689-3ubuntu1.5+esm36
|
|
| 14.04 LTS trusty |
Fixed 2:7.4.052-1ubuntu3.1+esm30
|
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CVSS version:
Base score
5.7 · Medium
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
Base score
7.8 · High
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8500-1
- Vim vulnerabilities
- 2 July 2026