CVE-2025-66029: Open OnDemand provides remote web access to supercomputers

Q: How do I fix CVE-2025-66029?

open ondemand: upgrade to newer than 4.0.8. Exact commands for each OS are on this page.

Q: Is CVE-2025-66029 being exploited?

CVE-2025-66029 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-2025-66029 affect?

CVE-2025-66029 affects open ondemand. Severity is high (CVSS 7.6). Open OnDemand provides remote web access to supercomputers. In versions 4.0.8 and prior, the Apache proxy allows sensitive headers to be passed to origin servers. This means malicious users can create an origin server on a compute node that

Routine

HIGH 7.6UPGRADE

CVE-2025-66029 is a high-severity flaw (CVSS 7.6) affecting open ondemand. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open OnDemand provides remote web access to supercomputers. In versions 4.0.8 and prior, the Apache proxy allows sensitive headers to be passed to origin servers. This means malicious users can create an origin server on a compute node that record these headers when unsuspecting users connect to it. Maintainers anticipate a patch in a 4.1 release. Workarounds exist for 4.0.x versions. Using `custom_location_directives` in `ood_portal.yml` in vers

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-522, CWE-523
Published	2025-12-17
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

2025-12-17 23:16 UTCPublished CVE record published
2026-06-17 09:56 UTCUpdated Record last modified

osc open ondemand UPGRADE

Affected: <= 4.0.8

Fixed in: newer than 4.0.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.0.8 (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.

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-2025-66029?

open ondemand: upgrade to newer than 4.0.8. Exact commands for each OS are on this page.

Is CVE-2025-66029 being exploited?

CVE-2025-66029 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-2025-66029 affect?

CVE-2025-66029 affects open ondemand. Severity is high (CVSS 7.6). Open OnDemand provides remote web access to supercomputers. In versions 4.0.8 and prior, the Apache proxy allows sensitive headers to be passed to origin servers. This means malicious users can create an origin server on a compute node that

How urgent is CVE-2025-66029?

Priority 29/100. High severity

Related CVEs

CVE-2026-26002 CRITICAL 9.8 UPGRADE Open OnDemand is an open-source high-performance computing portal

References

← Back to latest CVEs