Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Himmelblau-Idm | Himmelblau | >= 1.0.0, < 2.3.8 |
Related Weaknesses (CWE)
References
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-44wm-q286-ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-31979?
CVE-2026-31979 is a vulnerability with a CVSS score of 8.8 (HIGH). 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_...
How severe is CVE-2026-31979?
CVE-2026-31979 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31979?
Check the references section above for vendor advisories and patch information. Affected products include: Himmelblau-Idm Himmelblau.