Use After Free in Vim
CVE-2025-55157
Vim is an open source, command line text editor. In versions from 9.1.1231 to before 9.1.1400, When processing nested tuples in Vim script, an error during evaluation can trigger a use-after-free in Vim’s internal tuple reference management. Specifically, the tuple_unref() function may access already freed memory due to improper lifetime handling, leading to memory corruption. The exploit requires direct user interaction, as the script must be explicitly executed within Vim. This issue has been patched in version 9.1.1400.
Vulnerability class: Use-After-Free
EPSS: 0.003 (27.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Vim — versions >= 9.1.1231, < 9.1.1400
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-55157?
- CVE-2025-55157 is a high-severity vulnerability in Vim, classified under Use After Free. CVSS score: 8.8/10. Published 2025-08-11.
- How severe is CVE-2025-55157?
- High severity. CVSS v3 base score is 8.8 out of 10.