What is CVE-2023-3891?

CVE-2023-3891 is a high-severity vulnerability in Lapce, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.3/10. Published 2023-09-15.

How severe is CVE-2023-3891?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Lapce

CVE-2023-3891

Race condition in Lapce v0.2.8 allows an attacker to elevate privileges on the system

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2023-09-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (19.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Lapce — versions 0.2.8

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

fluidattacks.com/advisories/aerosmith (Exploit, Third Party Advisory, third-party-advisory)
lapce.dev (Product, product)
github.com/lapce/lapce/releases/tag/v0.3.0 (patch)

Frequently asked questions

What is CVE-2023-3891?: CVE-2023-3891 is a high-severity vulnerability in Lapce, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.3/10. Published 2023-09-15.
How severe is CVE-2023-3891?: High severity. CVSS v3 base score is 7.3 out of 10.