Is there a public exploit for CVE-2026-4878?

No public exploit for CVE-2026-4878 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-4878?

CVE-2026-4878 scores CVSS 6.7 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.2%.

What does CVE-2026-4878 affect?

CVE-2026-4878 affects Red Hat Red Hat AI Inference Server 3.2, Red Hat OpenShift distributed tracing 3.9.3, Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4.17, Cert Manager support for Red Hat OpenShift release 1.20.

6.7 Medium

A flaw was found in libcap.

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 capsetfile() 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.

Assessment

CVSS: 6.7 (v3.1)
Severity: Medium
EPSS: 0.2% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 9 April 2026
Last updated: 4 November 2026
Affected: Red Hat · Cert Manager support for Red Hat OpenShift release 1.17 · Cert Manager support for Red Hat OpenShift release 1.18 · Cert Manager support for Red Hat OpenShift release 1.20 · Cost Management 4
Assigner: redhat

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

At the source

EUVD (ENISA)

References

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