CVE-2026-25749 Heap Overflow in Vim
A heap buffer overflow in Vim's tag file resolution allows attackers to execute arbitrary code or cause a crash via a crafted helpfile option.
- 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-2026-25749?
CVE-2026-25749 is a medium-severity memory corruption vulnerability in Vim Vim, published on 6 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 9.1.2132, a heap buffer overflow vulnerability exists in Vim's tag file resolution logic when processing the 'helpfile' option. The vulnerability is located in the get_tagfname() function in src/tag.c. When processing help file tags, Vim copies the user-controlled 'helpfile' option value into a fixed-size heap buffer of MAXPATHL + 1 bytes (typically 4097 bytes) using an unsafe STRCPY() operation without any bounds checking. This issue has been patched in version 9.1.2132.
Weakness: CWE-122
Which versions are affected by CVE-2026-25749?
It affects 2 products.
Linux distribution packages (27)
vim-data AlmaLinux:10 | All versions | 2:9.1.083-6.el10_1.1 |
vim-filesystem AlmaLinux:10 | All versions | 2:9.1.083-6.el10_1.1 |
vim-X11 AlmaLinux:8 | All versions | 2:8.0.1763-22.el8_10 |
vim-common AlmaLinux:8 | All versions | 2:8.0.1763-22.el8_10 |
vim-enhanced AlmaLinux:8 | All versions | 2:8.0.1763-22.el8_10 |
vim-filesystem AlmaLinux:8 | All versions | 2:8.0.1763-22.el8_10 |
vim-minimal AlmaLinux:8 | All versions | 2:8.0.1763-22.el8_10 |
vim-X11 AlmaLinux:9 | All versions | 2:8.2.2637-23.el9_7.1 |
vim-common AlmaLinux:9 | All versions | 2:8.2.2637-23.el9_7.1 |
vim-enhanced AlmaLinux:9 | All versions | 2:8.2.2637-23.el9_7.1 |
vim-filesystem AlmaLinux:9 | All versions | 2:8.2.2637-23.el9_7.1 |
vim-minimal AlmaLinux:9 | All versions | 2:8.2.2637-23.el9_7.1 |
vim Red Hat:enterprise_linux:10.1 | All versions | 2:9.1.083-6.el10_1.1 |
vim-X11 Red Hat:enterprise_linux:10.1 | All versions | 2:9.1.083-6.el10_1.1 |
vim-enhanced Red Hat:enterprise_linux:10.1 | All versions | 2:9.1.083-6.el10_1.1 |
vim-minimal Red Hat:enterprise_linux:10.1 | All versions | 2:9.1.083-6.el10_1.1 |
vim-X11 Red Hat:enterprise_linux:8::appstream | All versions | 2:8.0.1763-22.el8_10 |
vim-enhanced Red Hat:enterprise_linux:8::appstream | All versions | 2:8.0.1763-22.el8_10 |
vim Red Hat:enterprise_linux:8::baseos | All versions | 2:8.0.1763-22.el8_10 |
vim-minimal Red Hat:enterprise_linux:8::baseos | All versions | 2:8.0.1763-22.el8_10 |
vim-X11 Red Hat:enterprise_linux:9::appstream | All versions | 2:8.2.2637-23.el9_7.1 |
vim-enhanced Red Hat:enterprise_linux:9::appstream | All versions | 2:8.2.2637-23.el9_7.1 |
vim Red Hat:enterprise_linux:9::baseos | All versions | 2:8.2.2637-23.el9_7.1 |
vim-minimal Red Hat:enterprise_linux:9::baseos | All versions | 2:8.2.2637-23.el9_7.1 |
vim Rocky Linux:10 | All versions | 2:9.1.083-6.el10_1.1 |
vim Rocky Linux:8 | All versions | 2:8.0.1763-22.el8_10 |
vim Rocky Linux:9 | All versions | 2:8.2.2637-23.el9_7.1 |
Products include Neovim Neovim, Vim Vim.
How do I fix CVE-2026-25749?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-25749 being exploited?
There is no known exploitation of CVE-2026-25749 in the wild and no public exploit code.
Other vulnerabilities in Vim Vim
Sources
Also known as ALPINE-CVE-2026-25749, ALSA-2026:4442, ALSA-2026:4715, ALSA-2026:5602, AZL-76764, AZL-77411 and 15 more.