Use-after-free in Vim

1) Use-after-free

EUVDB-ID: #VU103998

Risk: High

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-26603

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the str_to_reg() function in src/register.c. A remote attacker can trick the victim into opening a specially crafted file and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Vim: 9.1.0 - 9.1.1114

CPE2.3

• cpe:2.3:a:vim_org:vim:9.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0000:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0001:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0002:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0003:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0004:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0005:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0006:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0007:*:*:*:*:*:*:*
• cpe:2.3:a:vim_org:vim:9.1.0008:*:*:*:*:*:*:*

External links

https://github.com/vim/vim/security/advisories/GHSA-63p5-mwg2-787v
https://github.com/vim/vim/commit/c0f0e2380e5954f4a52a131bf6b8

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.