CVE-2026-4878

Low

No strong exploitation signal.

CVSS base

6.7 MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS — probability of exploitation (30 days)

0.2%

10.4th percentile

CISA KEV

Not listed

Weakness / dates

CWE-367

Published 2026-04-09 · modified 2026-09-09

CVSS breakdown

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Attack Vector	L	Local
Attack Complexity	H	High
Privileges Required	L	Low
User Interaction	R	Required
Scope	U	Unchanged
Confidentiality	H	High
Integrity	H	High
Availability	H	High

Timeline

2026-04-09 — Published (NVD)
2026-09-09 — Last modified (NVD)

Description

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.

Affected

libcap_project redhat

References

Official: NVD · CVE.org