CVE-2026-34397: Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune

Routine

MEDIUM 6.3WATCHLISTUPGRADE

CVE-2026-34397 is a medium-severity flaw (CVSS 6.3) affecting himmelblau. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From versions 2.0.0-alpha to before 2.3.9 and 3.0.0-alpha to before 3.1.1, there is a conditional local privilege escalation vulnerability in an edge-case naming collision. Only authenticated himmelblau users whose mapped CN/short name exactly matches a privileged local group name (e.g., "sudo", "wheel", "docker", "adm") can cause the NSS module to resolve that group

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-269
Published	2026-04-01
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: himmelblau-idm

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-01 18:16 UTCPublished CVE record published
2026-06-17 10:39 UTCUpdated Record last modified

himmelblau-idm himmelblau UPGRADE

Affected: >= 2.0.0 and < 2.3.9 · >= 3.0.0 and < 3.1.1

Fixed in: 2.3.9, 3.1.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy himmelblau || rpm -q himmelblau || himmelblau --version

2. UPGRADE to 2.3.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade himmelblau

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade himmelblau

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison himmelblau sudo apt install himmelblau=<VERSION_BEFORE_2.0.0> sudo apt-mark hold himmelblau

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list himmelblau sudo dnf downgrade himmelblau-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add himmelblau

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34397?

himmelblau: upgrade to 2.3.9, 3.1.1. Exact commands for each OS are on this page.

Is CVE-2026-34397 being exploited?

CVE-2026-34397 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34397 affect?

CVE-2026-34397 affects himmelblau. Severity is medium (CVSS 6.3). Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From versions 2.0.0-alpha to before 2.3.9 and 3.0.0-alpha to before 3.1.1, there is a conditional local privilege escalation vulnerability in an edge-case nami

How urgent is CVE-2026-34397?

Priority 33/100. Public exploit reference; On your watchlist

Software pages

Docker vulnerabilities · Azure vulnerabilities · Sudo vulnerabilities

References

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