SB2026060171 - Out-of-bounds read in Vim

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: N/A)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to out-of-bounds read in the update_snapshot() function in src/terminal.c when processing terminal screen snapshots in a :terminal window. A local user can emit terminal output containing a cell with a base character and five combining marks to cause a denial of service.

The issue can be triggered when the user enters Terminal-Normal mode or when the terminal job exits.

Remediation

Install update from vendor's website.

References

• https://github.com/vim/vim/security/advisories/GHSA-47gw-8gc3-mgcm
• https://github.com/vim/vim/commit/63680c6d3d52477817b49cd1a66e7aabe8a7aa19