What is CVE-2023-4734?

CVE-2023-4734 is a high-severity vulnerability in Apple macOS, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2023-09-02.

How severe is CVE-2023-4734?

High severity. CVSS v3 base score is 7.8 out of 10.

Integer overflow in Apple macOS

CVE-2023-4734

Integer Overflow or Wraparound in GitHub repository vim/vim prior to 9.0.1846.

Vulnerability class: Integer Overflow

Published 2023-09-02 · last modified 2026-09-18.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Apple macOS
Neovim
Vim
Vim Vim/vim — versions unspecified

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

huntr.dev/bounties/688e4382-d2b6-439a-a54e-484780f82217 (Exploit, Patch, Third Party Advisory)
github.com/vim/vim/commit/4c6fe2e2ea62469642ed1d80b16d39e616b25cf5 (Patch)
support.apple.com/kb/HT213984 (Third Party Advisory, Release Notes)
seclists.org/fulldisclosure/2023/Oct/24 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2023-4734?: CVE-2023-4734 is a high-severity vulnerability in Apple macOS, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2023-09-02.
How severe is CVE-2023-4734?: High severity. CVSS v3 base score is 7.8 out of 10.