CVE-2026-26002: Open OnDemand is an open-source high-performance computing portal

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-26002 is a critical-severity flaw (CVSS 9.8) affecting open ondemand. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open OnDemand is an open-source high-performance computing portal. The Files application in OnDemand versions prior to 4.0.9 and 4.1.3 is susceptible to malicious input when navigating to a directory. This has been patched in versions 4.0.9 and 4.1.3. Versions below this remain susceptible.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-74
Published	2026-03-04
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2026-03-04 23:16 UTCPublished CVE record published
2026-06-17 10:25 UTCUpdated Record last modified

osc open ondemand UPGRADE

Affected: < 3.1.16 · >= 4.0.0 and < 4.0.9 · >= 4.1.0 and < 4.1.3

Fixed in: 3.1.16, 4.0.9, 4.1.3

Safe to downgrade to: a release before 4.0.0

1. Check installed version

apt-cache policy open-ondemand || rpm -q open-ondemand || open-ondemand --version

2. UPGRADE to 3.1.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-ondemand

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-ondemand

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 4.0.0 (Debian / Ubuntu)

apt-cache madison open-ondemand sudo apt install open-ondemand=<VERSION_BEFORE_4.0.0> sudo apt-mark hold open-ondemand

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

dnf --showduplicates list open-ondemand sudo dnf downgrade open-ondemand-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add open-ondemand

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-2026-26002?

open ondemand: upgrade to 3.1.16, 4.0.9, 4.1.3. Exact commands for each OS are on this page.

Is CVE-2026-26002 being exploited?

CVE-2026-26002 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-2026-26002 affect?

CVE-2026-26002 affects open ondemand. Severity is critical (CVSS 9.8). Open OnDemand is an open-source high-performance computing portal. The Files application in OnDemand versions prior to 4.0.9 and 4.1.3 is susceptible to malicious input when navigating to a directory. This has been patched in versions 4.0.9

How urgent is CVE-2026-26002?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-66029 HIGH 7.6 UPGRADE Open OnDemand provides remote web access to supercomputers

References

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