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CVE-2026-73070— Vim: Stack Buffer Overflow in the Vim Socket Server

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组织开源的一款高效的文本编辑器。 Vim 9.2.0842之前版本存在缓冲区错误漏洞，该漏洞源于src/socketserver.c中的socketserver_accept()函数接受无限制的客户端连接，导致描述符溢出fd_set结构和固定大小的pollfd数组，可能允许本地进程连接服务器套接字，破坏栈内存或终止Vim服务器。

CVSS 6.8 · Medium EPSS 0.11% · P1

Affected Version Matrix 1

VendorProduct Version RangeStatus
vim vim < 9.2.0842 affected
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I. Basic Information for CVE-2026-73070

Vulnerability Information
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Vulnerability Title
Vim: Stack Buffer Overflow in the Vim Socket Server
Source: CVE Program / CVE List V5
Vulnerability Description
Vim is an open source, command line text editor. Prior to 9.2.0842, the socket server backend in src/socketserver.c accepts unbounded client connections in socketserver_accept(), causing descriptors to overflow fd_set structures in src/channel.c and fixed-size struct pollfd arrays in src/os_unix.c, which allows a local process that can connect to the server socket to corrupt stack memory or terminate the Vim server. This issue is fixed in version 9.2.0842.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
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组织开源的一款高效的文本编辑器。 Vim 9.2.0842之前版本存在缓冲区错误漏洞，该漏洞源于src/socketserver.c中的socketserver_accept()函数接受无限制的客户端连接，导致描述符溢出fd_set结构和固定大小的pollfd数组，可能允许本地进程连接服务器套接字，破坏栈内存或终止Vim服务器。
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 < 9.2.0842 -

II. Public POCs for CVE-2026-73070

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III. Intelligence Information for CVE-2026-73070

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Patches & Fixes for CVE-2026-73070 (1)

Vendor Advisories for CVE-2026-73070 (1)

Vendor Pages for CVE-2026-73070 (1)

Same Patch Batch · vim · 2026-08-11 · 8 CVEs total

CVE-2026-73078 8.6 HIGH Vim: Arbitrary Code Execution via Netrw Menu Construction
CVE-2026-73072 8.5 HIGH Vim: Heap Buffer Overflow when Loading a Spell File
CVE-2026-73076 8.4 HIGH Vim: Arbitrary Command Execution via Malicious `.VimballRecord` Entry Replay in `vimball.v
CVE-2026-73077 8.4 HIGH Vim: Arbitrary Code Execution via Shell Keyword Lookup
CVE-2026-73074 7.1 HIGH Vim: Heap Buffer Overflow in Text Property Handling
CVE-2026-73075 4.6 MEDIUM Vim: Out-of-bounds Access in Popup Opacity Handling
CVE-2026-73071 3.3 LOW Vim: Use-after-free in JSON Decoding

IV. Related Vulnerabilities

Same product: vim
Same vendor: vim
Same weakness: CWE-121

V. Comments for CVE-2026-73070

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