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CVE

CVE-2026-31979

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

CVE-2026-31979

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.8
-
3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31979.json, https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-44wm-q286-ghq3, https://nvd.nist.gov/vuln/detail/CVE-2026-31979

Severity

8.8

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.8
EPSS Probability
0.00022%
EPSS Percentile
0.06323%
Introduced Version
d01709bf0100183045927c03b90db78fb8e40bda,cf9255c3ffea77705e9725b18f39d520b3b07f59
Fix Available
dec3693cbb151b4686b0d926b95379c71f391b1a,9079a98b44beb1c4e77215a262b95e6fd44c1dfb

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