What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-10-29
• Weakness: CWE-121

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.

Affected products

• vim/vim: from 9.2.0512 before 9.2.0842 — fixed in 9.2.0842

How to fix

Upgrade to a fixed version: vim/vim 9.2.0842. Check the vendor advisory for mitigations.

References

• https://github.com/vim/vim/commit/5598618b2daf8e36b3bf0251caaefcf0bf8e85e4
• https://github.com/vim/vim/releases/tag/v9.2.0842
• https://github.com/vim/vim/security/advisories/GHSA-49m8-wwxj-mr69

Get alerted when CVE-2026-73070 or the next vulnerability affects your stack