CVE-2026-44423: ShellHub is a centralized SSH gateway

Q: How do I fix CVE-2026-44423?

shellhub: upgrade to 0.24.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-44423 being exploited?

CVE-2026-44423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44423 affect?

CVE-2026-44423 affects shellhub. Severity is medium (CVSS 6.5). ShellHub is a centralized SSH gateway. Prior to 0.24.2, GET /api/sessions/:uid returns the full session object for any authenticated caller, without scoping by the caller's tenant. An authenticated user can read session records (SSH usernam

Q: How urgent is CVE-2026-44423?

Priority 32/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-44423 is a medium-severity flaw (CVSS 6.5) affecting shellhub. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ShellHub is a centralized SSH gateway. Prior to 0.24.2, GET /api/sessions/:uid returns the full session object for any authenticated caller, without scoping by the caller's tenant. An authenticated user can read session records (SSH username, device UID, remote IP, terminal type, authenticated flag, timestamps) belonging to any other namespace. This vulnerability is fixed in 0.24.2.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-05-13
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: shellhub

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

Am I affected?

Timeline

2026-05-13 22:16 UTCPublished CVE record published
2026-06-17 10:50 UTCUpdated Record last modified

shellhub shellhub UPGRADE

Affected: < 0.24.2

Fixed in: 0.24.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.24.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade shellhub

Note

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

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-2026-44423?

shellhub: upgrade to 0.24.2. Exact commands for each OS are on this page.

Is CVE-2026-44423 being exploited?

CVE-2026-44423 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-2026-44423 affect?

CVE-2026-44423 affects shellhub. Severity is medium (CVSS 6.5). ShellHub is a centralized SSH gateway. Prior to 0.24.2, GET /api/sessions/:uid returns the full session object for any authenticated caller, without scoping by the caller's tenant. An authenticated user can read session records (SSH usernam

How urgent is CVE-2026-44423?

Priority 32/100. Public exploit reference

Related CVEs

CVE-2026-44426 MEDIUM 6.5 UPGRADE ShellHub is a centralized SSH gateway
CVE-2026-44425 MEDIUM 5.4 UPGRADE ShellHub is a centralized SSH gateway
CVE-2026-44424 MEDIUM 6.5 UPGRADE ShellHub is a centralized SSH gateway

References

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