CVE-2026-56391
coreutilsVulnerabilityCVSS 4.6
No public exploitation has been reported so far. No distribution fix is listed yet; apply vendor mitigations and monitor.
Recommended action: Track your distribution's security tracker and apply the fix as soon as it ships.
Severity metrics
CVSS 4.0 : 4.6 MEDIUM
Attack vectorLocal
Attack complexityLow
Attack requirementsNone
Privileges requiredNone
User interactionActive
Confidentiality impactLow
Integrity impactNone
Availability impactLow
Subsequent confidentialityNone
Subsequent integrityNone
Subsequent availabilityNone
Vector: AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Affected & fixed versions by distribution
Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.
| Distribution | Package | Affected | Fixed version | Status |
|---|---|---|---|---|
| Debian:11 | coreutils | - | - | affected (no fix yet) |
| Debian:12 | coreutils | - | - | affected (no fix yet) |
| Debian:13 | coreutils | - | - | affected (no fix yet) |
| Debian:14 | coreutils | - | - | affected (no fix yet) |
| Ubuntu:14.04:LTS | coreutils | - | - | affected (no fix yet) |
| Ubuntu:16.04:LTS | coreutils | - | - | affected (no fix yet) |
| Ubuntu:18.04:LTS | coreutils | - | - | affected (no fix yet) |
| Ubuntu:20.04:LTS | coreutils | - | - | affected (no fix yet) |
| Ubuntu:22.04:LTS | coreutils | - | - | affected (no fix yet) |
| Ubuntu:24.04:LTS | coreutils | - | - | affected (no fix yet) |
| Ubuntu:26.04:LTS | coreutils | - | - | affected (no fix yet) |