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CVE-2026-52859— Vim: Out-of-bounds Read in Terminal Screen Snapshot

Quick assessment

Affected
vim vim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vim是Vim开源的一款跨平台的文本编辑器。 Vim 9.2.0565之前版本存在缓冲区错误漏洞，该漏洞源于update_snapshot()函数在复制可见终端屏幕到滚动缓冲区时，对每个屏幕单元的chars[]数组无上限遍历，当单元填满所有VTERM_MAX_CHARS_PER_CELL（6）个槽位时，libvterm返回无终止NUL的数组，导致越界读取并附加到仅保留6个字符的缓冲区，可能导致崩溃。

AI Predicted 8.1 Difficulty: Trivial EPSS 0.55% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
vim vim < 9.2.0565 affected
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I. Basic Information for CVE-2026-52859

Vulnerability Information
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Vulnerability Title
Vim: Out-of-bounds Read in Terminal Screen Snapshot
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Vim 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vim是Vim开源的一款跨平台的文本编辑器。 Vim 9.2.0565之前版本存在缓冲区错误漏洞，该漏洞源于update_snapshot()函数在复制可见终端屏幕到滚动缓冲区时，对每个屏幕单元的chars[]数组无上限遍历，当单元填满所有VTERM_MAX_CHARS_PER_CELL（6）个槽位时，libvterm返回无终止NUL的数组，导致越界读取并附加到仅保留6个字符的缓冲区，可能导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vim vim < 9.2.0565 -

II. Public POCs for CVE-2026-52859

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III. Intelligence Information for CVE-2026-52859

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Patches & Fixes for CVE-2026-52859 (1)

Vendor Advisories for CVE-2026-52859 (1)

Vendor Pages for CVE-2026-52859 (1)

Same Patch Batch · vim · 2026-06-11 · 5 CVEs total

CVE-2026-52860 7.5 HIGH Vim: Arbitrary Code Execution via Python Omni-Completion
CVE-2026-47162 7.3 HIGH Vim: Vimscript Code Injection in netrw NetrwBookHistSave() via crafted directory name
CVE-2026-52858 Vim: Arbitrary Code Execution via Python Omni-Completion
CVE-2026-47167 Vim: Vimscript Code Injection in cucumber filetype plugin via crafted step-definition rege

IV. Related Vulnerabilities

Same product: vim
Same vendor: vim
Same weakness: CWE-125

V. Comments for CVE-2026-52859

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