SB2026061856 - Out-of-bounds read in Vim

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-57451)

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

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

The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.

The vulnerability exists due to out-of-bounds read in get_text_props() in src/textprop.c when processing a crafted undo file during undo and subsequent line inspection. A remote attacker can supply a malicious source file and sibling .un~ undo file with a forged text property count to disclose sensitive information and cause a denial of service.

User interaction is required: 'undofile' must be enabled, the user must open the file and perform an undo operation, and a consumer such as prop_list() or screen redraw must inspect the restored line.

Remediation

Install update from vendor's website.

References

• https://github.com/vim/vim/security/advisories/GHSA-f36c-2qcp-7gpw
• https://github.com/vim/vim/commit/b2338ca90643e2f01ecb6547c1172716aaec4f79