CVE intelligence

CVE-2026-4878

Vulnerability intelligence

Published Apr 9, 2026Sources checked Nov 13, 2026

7.0HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-4878 and is rated High severity with a CVSS score of 7.0. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Sep 25, 2026

Release Notes CBL-Mariner Releases

Vendor-listed releases

2.60-8
2.69-14

CISA KEVNot listedBased on the latest collected catalog

EPSS0.2%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-4878?

A flaw was found in libcap. A local unprivileged user can exploit a Time-of-check-to-time-of-use (TOCTOU) race condition in the `cap_set_file()` function.

This allows an attacker with write access to a parent directory to redirect file capability updates to an attacker-controlled file. By doing so, capabilities can be injected into or stripped from unintended executables, leading to privilege escalation.

Source: NVD