Vulnerability · Published Jun 11, 2026 · Assigned by GitHub_M
CVE-2026-52859Vim: Out-of-bounds Read in Terminal Screen Snapshot
Medium 6.9
In plain English
A medium-severity out-of-bounds read in vim from vim. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Vim is an open source, command line text editor. Prior to version 9.2.0565, the update_snapshot() function in src/terminal.c copies the visible terminal screen into the scrollback buffer when a snapshot is taken. For each screen cell it walks the cell's chars[] array with no upper bound, stopping only when it encounters a NUL terminator. When a cell legitimately fills all VTERM_MAX_CHARS_PER_CELL (6) slots — a base character plus five combining marks — the bundled libvterm returns the array without a terminating NUL, so the loop reads past the fixed six-element array and appends the out-of-bounds values to a buffer reserved for only six characters. A program whose output is rendered inside a :terminal window can trigger this with a short byte sequence and no Vim scripting, leading to a crash. This issue has been patched in version 9.2.0565.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | vim-X11 | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-X11 | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-X11 | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-common | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-common | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-common | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-data | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:10 | vim-enhanced | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-enhanced | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-enhanced | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-filesystem | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-filesystem | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-filesystem | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | vim-minimal | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| AlmaLinux:8 | vim-minimal | 2:8.0.1763-31.el8_10.7 | ALSA-2026:66348 |
| AlmaLinux:9 | vim-minimal | 2:8.2.2637-26.el9_8.21 | ALSA-2026:66366 |
| AlmaLinux:10 | xxd | 2:9.1.083-9.el10_2.20 | ALSA-2026:66336 |
| Alpine:v3.23 | vim | 9.2.0567-r0 | ALPINE-CVE-2026-52859 |
| Alpine:v3.24 | vim | 9.2.0567-r0 | ALPINE-CVE-2026-52859 |
| Debian:12 | vim | no fix listed | DEBIAN-CVE-2026-52859 |
| Debian:13 | vim | 2:9.1.1230-2+deb13u1 | DEBIAN-CVE-2026-52859 |
| Debian:14 | vim | 2:9.2.0782-1 | DEBIAN-CVE-2026-52859 |
| Rocky Linux:10 | vim | 2:9.1.083-9.el10_2.20 | RLSA-2026:66336 |
| Rocky Linux:8 | vim | 2:8.0.1763-31.el8_10.7 | RLSA-2026:66348 |
| Rocky Linux:9 | vim | 2:8.2.2637-26.el9_8.21 | RLSA-2026:66366 |
| Ubuntu:22.04:LTS | vim | 2:8.2.3995-1ubuntu2.32 | UBUNTU-CVE-2026-52859 |
| Ubuntu:24.04:LTS | vim | 2:9.1.0016-1ubuntu7.16 | UBUNTU-CVE-2026-52859 |
| Ubuntu:25.10 | vim | 2:9.1.0967-1ubuntu6.7 | UBUNTU-CVE-2026-52859 |
| Ubuntu:26.04:LTS | vim | 2:9.1.2141-1ubuntu4.5 | UBUNTU-CVE-2026-52859 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
References
- https://github.com/vim/vim/security/advisories/GHSA-47gw-8gc3-mgcm x_refsource_CONFIRM
- https://github.com/vim/vim/commit/63680c6d3d52477817b49cd1a66e7aabe8a7aa19 x_refsource_MISC
- https://github.com/vim/vim/releases/tag/v9.2.0565 x_refsource_MISC