CVE-2026-31979 HIGH

CVE-2026-31979: himmelblaud-tasks: local privilege escalation via /tmp symlink attack on Kerberos ccache

Vendor Himmelblau-Idm
Product himmelblau
Weakness CWE-59
Published March 11, 2026
Last update March 11, 2026
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. Prior to 3.1.0 and 2.3.8, the himmelblaud-tasks daemon, running as root, writes Kerberos cache files under /tmp/krb5cc_<uid> without symlink protections. Since commit 87a51ee, PrivateTmp is explicitly removed from the tasks daemon's systemd hardening, exposing it to the host /tmp. A local user can exploit this via symlink attacks to chown or overwrite arbitrary files, achieving local privilege escalation. This vulnerability is fixed in 3.1.0 and 2.3.8.

Key dates

02Disclosure timeline

March 11, 2026 CVE published
March 11, 2026 Record updated