Vim up to 9.2.0841 Socket Server Backend src/socketserver.c socketserver_accept stack-based overflow

Summaryinfo

A vulnerability labeled as problematic has been found in Vim up to 9.2.0841. This impacts the function socketserver_accept of the file src/socketserver.c of the component Socket Server Backend. The manipulation results in stack-based overflow. This vulnerability was named CVE-2026-73070. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in Vim up to 9.2.0841. Affected is the function socketserver_accept of the file src/socketserver.c of the component Socket Server Backend. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-73070 since 08/10/2026. The exploitability is told to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 9.2.0842 eliminates this vulnerability.

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Productinfo

Type

• Word Processing Software

Name

• Vim

Version

• 9.2.0841

License

• open-source

Website

• Product: https://github.com/vim/vim/

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