CVE-2026-42277: Onyx is an open-source AI platform

Routine

MEDIUM 6.5UPGRADE

CVE-2026-42277 is a medium-severity flaw (CVSS 6.5) affecting onyx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifies the caller is authenticated but never checks that the file belongs to them. An attacker who knows or obtains a file UUID can access confidential documents, chat attachments, and other files uploaded by any use

Why this priority

No elevated risk signals yet

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 90%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-05-08
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2026-05-08 05:16 UTCPublished CVE record published
2026-06-17 10:47 UTCUpdated Record last modified

onyx onyx UPGRADE

Affected: < 3.0.9 · >= 3.1.0 and < 3.1.6 · >= 3.2.0 and < 3.2.6

Fixed in: 3.0.9, 3.1.6, 3.2.6

Safe to downgrade to: a release before 3.1.0

1. Check installed version

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

2. UPGRADE to 3.0.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade onyx

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 3.1.0 (Debian / Ubuntu)

apt-cache madison onyx sudo apt install onyx=<VERSION_BEFORE_3.1.0> sudo apt-mark hold onyx

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

dnf --showduplicates list onyx sudo dnf downgrade onyx-<VERSION_BEFORE_3.1.0> sudo dnf versionlock add onyx

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-2026-42277?

onyx: upgrade to 3.0.9, 3.1.6, 3.2.6. Exact commands for each OS are on this page.

Is CVE-2026-42277 being exploited?

CVE-2026-42277 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-2026-42277 affect?

CVE-2026-42277 affects onyx. Severity is medium (CVSS 6.5). Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifies

How urgent is CVE-2026-42277?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2026-42276 MEDIUM 4.3 UPGRADE Onyx is an open-source AI platform

References

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