CVE-2026-28422 Vim has stack-buffer-overflow in build_stl_str_hl()
A stack-buffer-overflow in Vim's statusline rendering allows attackers to execute arbitrary code or cause a crash via crafted multi-byte characters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-28422?
CVE-2026-28422 is a low-severity memory corruption vulnerability in Vim Vim, published on 27 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Vim is an open source, command line text editor. Prior to version 9.2.0078, a stack-buffer-overflow occurs in `build_stl_str_hl()` when rendering a statusline with a multi-byte fill character on a very wide terminal. Version 9.2.0078 patches the issue.
Weakness: CWE-121
Which versions are affected by CVE-2026-28422?
It affects 1 product.
Products include Vim Vim.
How do I fix CVE-2026-28422?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-28422 being exploited?
There is no known exploitation of CVE-2026-28422 in the wild and no public exploit code.
Other vulnerabilities in Vim Vim
Sources
Also known as ALPINE-CVE-2026-28422, AZL-78512, BELL-CVE-2026-28422, DEBIAN-CVE-2026-28422, ECHO-f134-6ef2-2906, GHSA-gmqx-prf2-8mwf.