How severe is CVE-2026-31979?

CVE-2026-31979 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-31979 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31979?

CVE-2026-31979 affects Himmelblau-idm Himmelblau. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31979?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-31979 have an EU (EUVD) identifier?

Yes. CVE-2026-31979 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11332.

When was CVE-2026-31979 published?

CVE-2026-31979 was published on 2026-03-11 and last updated on 2026-06-17.

CVE-2026-31979

CVE-2026-31979 is a high-severity vulnerability in Himmelblau-idm Himmelblau with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-59.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11332
Weakness: CWE-59
Affected product: Himmelblau-idm Himmelblau
Published: 2026-03-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-31979?: 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.
How severe is CVE-2026-31979?: CVE-2026-31979 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-31979 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31979?: CVE-2026-31979 affects Himmelblau-idm Himmelblau. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31979?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-31979 have an EU (EUVD) identifier?: Yes. CVE-2026-31979 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11332.
When was CVE-2026-31979 published?: CVE-2026-31979 was published on 2026-03-11 and last updated on 2026-06-17.

References

https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-44wm-q286-ghq3

Affected products (1)

cpe:2.3:a:himmelblau-idm:himmelblau:*:*:*:*:*:*:*:*

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