CVE-2025-55158

Vim double-free vulnerability during Vim9 script import operations

Description

Vim is an open source, command line text editor. In versions from 9.1.1231 to before 9.1.1406, when processing nested tuples during Vim9 script import operations, an error during evaluation can trigger a double-free in Vim’s internal typed value (typval_T) management. Specifically, the clear_tv() function may attempt to free memory that has already been deallocated, due to improper lifetime handling in the handle_import / ex_import code paths. The vulnerability can only be triggered if a user explicitly opens and executes a specially crafted Vim script. This issue has been patched in version 9.1.1406.

Category

6.9
CVSS
Severity: Medium
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.04%
Vendor Advisory github.com
Affected: vim vim
Published at:
Updated at:

References

Link Tags
https://github.com/vim/vim/security/advisories/GHSA-5fg8-wvx3-583x vendor advisory
https://github.com/vim/vim/commit/9772025d24e939fd84b85748ce35c26874c05775 patch
https://github.com/vim/vim/releases/tag/v9.1.1406 patch

Frequently Asked Questions

What is the severity of CVE-2025-55158?
CVE-2025-55158 has been scored as a medium severity vulnerability.
How to fix CVE-2025-55158?
To fix CVE-2025-55158, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-55158 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-55158 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-55158?
CVE-2025-55158 affects vim vim.
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