Buffer underflow in Vim - CVE-2026-73075

Vulnerability identifier: #VU139257

CSH Severity: Low

CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-73075

CWE-ID: CWE-124

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to read and modify memory outside the bounds of a heap array.

The vulnerability exists due to out-of-bounds write in popup_mark_opacity_zindex() in src/popupwin.c when processing Vim script-created popup windows with the "clipwindow", "opacity", and text property anchor options after the host window is scrolled so the anchor moves above the visible area. A remote attacker can trick the victim into running a crafted Vim script to read and modify memory outside the bounds of a heap array.

The issue is not reachable by opening a file alone, because a modeline cannot call functions.

Vim
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Desktop Applications Module
Basesystem Module
openSUSE Leap
vim-data
vim-debugsource
vim-debuginfo
gvim
gvim-debuginfo
vim
vim-data-common
vim-small-debuginfo
vim-small

Install security update from vendor's website.

Vim - update to 9.2.0843
vim-data - addressed in versions 9.2.0957-17.76.1, 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
vim-debugsource - addressed in versions 9.2.0957-17.76.1, 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
vim-debuginfo - addressed in versions 9.2.0957-17.76.1, 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
gvim - addressed in versions 9.2.0957-17.76.1, 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
gvim-debuginfo - addressed in versions 9.2.0957-17.76.1, 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
vim - addressed in versions 9.2.0957-17.76.1, 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
vim-data-common - addressed in versions 9.2.0957-17.76.1, 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
vim-small-debuginfo - addressed in versions 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1
vim-small - addressed in versions 9.2.0957-150000.5.102.1, 9.2.0957-150500.20.64.1

• https://github.com/vim/vim/security/advisories/GHSA-pmvp-6rcj-98p4
• https://github.com/vim/vim/commit/975e191dc817d8d00abca7197c4529a417c2f805

• Buffer underflow in Vim
• SUSE update for vim
• SUSE update for vim
• SUSE update for vim