Is CVE-2026-31979 in the CISA KEV catalog?

No. CVE-2026-31979 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-31979?

CVE-2026-31979 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2026-31979?

CVE-2026-31979 has an EPSS score of 0.20% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-31979?

Upgrade himmelblau to 3.1.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-31979

HIGH

8.8

CVSS v3

NVD

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.

CWE-59Link Following

How to fix

Remediation Available

himmelblauNVD

Affected:>= 3.0.0, < 3.1.0Fixed in:3.1.0CVE-2026-31979derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Exploit1

github.com

Related Vulnerabilities

Other CWE-59 (Link Following) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30333	High	7.5	99%	KEV + Ransom	Fix
CVE-2021-21300	High	8.0	89%	-	Fix
CVE-2021-32610	High	7.1	73%	-	Fix
CVE-2020-36193	High	7.5	71%	KEV	Fix
CVE-2023-40028	Medium	4.9	58%	-	Fix
CVE-2020-0787	High	7.8	43%	KEV + Ransom	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-16.