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OpenAdvisories
Medium · 5.7 CVE-2026-55693 EUVD-2026-39452

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

Published Jun 25, 2026 · Updated Jun 26, 2026 · Assigned by GitHub_M

Vendor: vim Product: vim Package: vim Package: vim Package: vim Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

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 products

VendorProductAffectedFixed
vim vim < 9.2.0653 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 vim 2:9.2.0782-1 —
Debian 13 vim 2:9.1.1230-2+deb13u1 —
Debian 12 vim No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.04 LTS vim 2:9.1.2141-1ubuntu4.6 USN-8500-1
Ubuntu 25.10 vim 2:9.1.0967-1ubuntu6.8 USN-8500-1
Ubuntu 24.04 LTS vim 2:9.1.0016-1ubuntu7.17 USN-8500-1
Ubuntu 22.04 LTS vim 2:8.2.3995-1ubuntu2.33 USN-8500-1
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 20.04 LTS vim 2:8.1.2269-1ubuntu5.32+esm9 USN-8500-1
Ubuntu Pro 18.04 LTS vim 2:8.0.1453-1ubuntu1.13+esm21 USN-8500-1
Ubuntu Pro 16.04 LTS vim 2:7.4.1689-3ubuntu1.5+esm36 USN-8500-1
Ubuntu Pro 14.04 LTS vim 2:7.4.052-1ubuntu3.1+esm30 USN-8500-1

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
RHEL 10 vim +3 2:9.1.083-9.el10_2.12 RHSA-2026:48650
RHEL 9 vim +3 2:8.2.2637-26.el9_8.13 RHSA-2026:47982
RHEL 8 vim +3 2:8.0.1763-31.el8_10 RHSA-2026:48703
Show 7 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
RHEL 10.0 EUS vim +3 2:9.1.083-5.el10_0.4 RHSA-2026:55431
RHEL 9.6 EUS vim +5 2:8.2.2637-22.el9_6.4 RHSA-2026:70818
RHEL 9.4 E4S vim +5 2:8.2.2637-20.el9_4.4 RHSA-2026:72465
RHEL 9.2 E4S vim +5 2:8.2.2637-20.el9_2.3 RHSA-2026:72466
RHEL 7 ELS vim +4 2:7.4.629-8.el7_9.2 RHSA-2026:68711
RHEL 6 ELS vim +4 2:7.4.629-5.el6_10.4 RHSA-2026:69128
Red Hat Hardened Images 1 vim +8 9.2.725-1.hum1 RHSA-2026:30267

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 xxd +6 2:9.1.083-9.el10_2.12 ALSA-2026:48650
AlmaLinux 9 vim-X11 +4 2:8.2.2637-26.el9_8.13 ALSA-2026:47982
AlmaLinux 8 vim-X11 +4 2:8.0.1763-31.el8_10 ALSA-2026:48703

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 vim 2:9.1.083-9.el10_2.12 RLSA-2026:48650
Rocky Linux 9 vim 2:8.2.2637-26.el9_8.13 RLSA-2026:47982
Rocky Linux 8 vim 2:8.0.1763-31.el8_10 RLSA-2026:48703

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 xxd +6 2:9.2.725-1.amzn2023.0.1 ALAS2023-2026-1940
Amazon Linux 2 xxd +6 2:9.0.2153-1.amzn2.0.8 ALAS2-2026-3804

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 vim 9.2.0735-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 xxd +6 2:9.1.083-9.0.1.el10_2.12 ELSA-2026-48650
Oracle Linux 9 vim-X11 +4 2:8.2.2637-26.0.1.el9_8.13 ELSA-2026-47982
Oracle Linux 8 vim-X11 +4 2:8.0.1763-31.0.1.el8_10 ELSA-2026-48703

Advisories 24

References