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CVE-2026-4878

high

A flaw was found in libcap.

Vendor / product: Libcap Project — libcap

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.

CVSS
7.0
7.0 (CVSS v3.1)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-04-09 16:16
Modified: 2026-11-04 23:17
NVD status: Modified
Last synced 1 hour ago
Verified against the source API 2026-11-04 23:38 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

libcap_project / libcap all versions
redhat / openshift_container_platform 4.0
redhat / enterprise_linux 8.0, 9.0, 10.0

Weakness classification (CWE)

CWE-367

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://access.redhat.com/errata/RHSA-2026:7473
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-4878
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2451615
Vendor advisory: https://access.redhat.com/errata/RHSA-2026:7473
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-4878
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2451615

References

Data sources

NVD CVE API 2.0 — fetched 2026-11-04 23:38 UTC · record ↗

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